--- a/dom/media/PeerConnection.js
+++ b/dom/media/PeerConnection.js
@@ -674,17 +674,17 @@ RTCPeerConnection.prototype = {
     // This entry-point handles both new and legacy call sig. Decipher which one
     let onSuccess;
     if (typeof optionsOrOnSuccess == "function") {
       onSuccess = optionsOrOnSuccess;
     } else {
       options = optionsOrOnSuccess;
     }
     return this._legacyCatch(onSuccess, onError, () => {
-      // TODO: Remove old constraint-like RTCOptions support soon (Bug 1064223).
+      // TODO: Remove error on constraint-like RTCOptions next cycle (1197021).
       // Note that webidl bindings make o.mandatory implicit but not o.optional.
       function convertLegacyOptions(o) {
         // Detect (mandatory OR optional) AND no other top-level members.
         let lcy = ((o.mandatory && Object.keys(o.mandatory).length) || o.optional) &&
             Object.keys(o).length == (o.mandatory? 1 : 0) + (o.optional? 1 : 0);
         if (!lcy) {
           return false;
         }
@@ -711,20 +711,21 @@ RTCPeerConnection.prototype = {
           if (o[k] === undefined) {
             delete o[k];
           }
         });
         return true;
       }
 
       if (options && convertLegacyOptions(options)) {
-        this.logWarning(
-          "Mandatory/optional in createOffer options is deprecated! Use " +
+        this.logError(
+          "Mandatory/optional in createOffer options no longer works! Use " +
             JSON.stringify(options) + " instead (note the case difference)!",
           null, 0);
+        options = {};
       }
 
       let origin = Cu.getWebIDLCallerPrincipal().origin;
       return this._chain(() => {
         let p = Promise.all([this.getPermission(), this._certificateReady])
           .then(() => new this._win.Promise((resolve, reject) => {
             this._onCreateOfferSuccess = resolve;
             this._onCreateOfferFailure = reject;

--- a/dom/media/tests/mochitest/mochitest.ini
+++ b/dom/media/tests/mochitest/mochitest.ini
@@ -84,16 +84,17 @@ skip-if = buildapp == 'b2g' || buildapp 
 [test_peerConnection_bug825703.html]
 [test_peerConnection_bug827843.html]
 skip-if = toolkit == 'gonk' || buildapp == 'mulet' # b2g(Bug 960442, video support for WebRTC is disabled on b2g)
 [test_peerConnection_bug834153.html]
 [test_peerConnection_bug1013809.html]
 skip-if = toolkit == 'gonk' # B2G emulator is too slow to handle a two-way audio call reliably
 [test_peerConnection_bug1042791.html]
 skip-if = buildapp == 'b2g' || buildapp == 'mulet' || os == 'android' # bug 1043403 # Bug 1141029 Mulet parity with B2G Desktop for TC
+[test_peerConnection_bug1064223.html]
 [test_peerConnection_capturedVideo.html]
 tags=capturestream
 skip-if = toolkit == 'gonk' || buildapp == 'mulet' # b2g(Bug 960442, video support for WebRTC is disabled on b2g)
 [test_peerConnection_captureStream_canvas_2d.html]
 skip-if = toolkit == 'gonk' || buildapp == 'mulet' # b2g(Bug 960442, video support for WebRTC is disabled on b2g)
 [test_peerConnection_captureStream_canvas_webgl.html]
 skip-if = toolkit == 'gonk' || buildapp == 'mulet' # b2g(Bug 960442, video support for WebRTC is disabled on b2g)
 # [test_peerConnection_certificates.html] # bug 1180968

--- a/dom/media/tests/mochitest/pc.js
+++ b/dom/media/tests/mochitest/pc.js
@@ -1249,72 +1249,16 @@ PeerConnectionWrapper.prototype = {
    */
   countTracksInConstraint : function(type, constraints) {
     if (!Array.isArray(constraints)) {
       return 0;
     }
     return constraints.reduce((sum, c) => sum + (c[type] ? 1 : 0), 0);
   },
 
-  /**
-   * Checks for audio in given offer options.
-   *
-   * @param options
-   *        The options to be examined.
-   */
-  audioInOfferOptions : function(options) {
-    if (!options) {
-      return 0;
-    }
-
-    var offerToReceiveAudio = options.offerToReceiveAudio;
-
-    // TODO: Remove tests of old constraint-like RTCOptions soon (Bug 1064223).
-    if (options.mandatory && options.mandatory.OfferToReceiveAudio !== undefined) {
-      offerToReceiveAudio = options.mandatory.OfferToReceiveAudio;
-    } else if (options.optional && options.optional[0] &&
-               options.optional[0].OfferToReceiveAudio !== undefined) {
-      offerToReceiveAudio = options.optional[0].OfferToReceiveAudio;
-    }
-
-    if (offerToReceiveAudio) {
-      return 1;
-    } else {
-      return 0;
-    }
-  },
-
-  /**
-   * Checks for video in given offer options.
-   *
-   * @param options
-   *        The options to be examined.
-   */
-  videoInOfferOptions : function(options) {
-    if (!options) {
-      return 0;
-    }
-
-    var offerToReceiveVideo = options.offerToReceiveVideo;
-
-    // TODO: Remove tests of old constraint-like RTCOptions soon (Bug 1064223).
-    if (options.mandatory && options.mandatory.OfferToReceiveVideo !== undefined) {
-      offerToReceiveVideo = options.mandatory.OfferToReceiveVideo;
-    } else if (options.optional && options.optional[0] &&
-               options.optional[0].OfferToReceiveVideo !== undefined) {
-      offerToReceiveVideo = options.optional[0].OfferToReceiveVideo;
-    }
-
-    if (offerToReceiveVideo) {
-      return 1;
-    } else {
-      return 0;
-    }
-  },
-
   checkLocalMediaTracks : function() {
     var observed = {};
     info(this + " Checking local tracks " + JSON.stringify(this.expectedLocalTrackInfoById));
     this._pc.getSenders().forEach(sender => {
       this.checkTrackIsExpected(sender.track, this.expectedLocalTrackInfoById, observed);
     });
 
     Object.keys(this.expectedLocalTrackInfoById).forEach(
@@ -1381,32 +1325,32 @@ PeerConnectionWrapper.prototype = {
     } else {
       this.remoteRequiresTrickleIce = requiresTrickleIce;
     }
 
     //TODO: how can we check for absence/presence of m=application?
 
     var audioTracks =
         this.countTracksInConstraint('audio', offerConstraintsList) ||
-      this.audioInOfferOptions(offerOptions);
+        ((offerOptions && offerOptions.offerToReceiveAudio) ? 1 : 0);
 
     info("expected audio tracks: " + audioTracks);
     if (audioTracks == 0) {
       ok(!desc.sdp.includes("m=audio"), "audio m-line is absent from SDP");
     } else {
       ok(desc.sdp.includes("m=audio"), "audio m-line is present in SDP");
       ok(desc.sdp.includes("a=rtpmap:109 opus/48000/2"), "OPUS codec is present in SDP");
       //TODO: ideally the rtcp-mux should be for the m=audio, and not just
       //      anywhere in the SDP (JS SDP parser bug 1045429)
       ok(desc.sdp.includes("a=rtcp-mux"), "RTCP Mux is offered in SDP");
     }
 
     var videoTracks =
         this.countTracksInConstraint('video', offerConstraintsList) ||
-      this.videoInOfferOptions(offerOptions);
+        ((offerOptions && offerOptions.offerToReceiveVideo) ? 1 : 0);
 
     info("expected video tracks: " + videoTracks);
     if (videoTracks == 0) {
       ok(!desc.sdp.includes("m=video"), "video m-line is absent from SDP");
     } else {
       ok(desc.sdp.includes("m=video"), "video m-line is present in SDP");
       if (this.h264) {
         ok(desc.sdp.includes("a=rtpmap:126 H264/90000"), "H.264 codec is present in SDP");
@@ -1762,21 +1706,21 @@ PeerConnectionWrapper.prototype = {
     isnot(numIceConnections, 0, "Number of ICE connections according to stats is not zero");
     if (answer.sdp.includes('a=group:BUNDLE')) {
       is(numIceConnections, 1, "stats reports exactly 1 ICE connection");
     } else {
       // This code assumes that no media sections have been rejected due to
       // codec mismatch or other unrecoverable negotiation failures.
       var numAudioTracks =
           this.countTracksInConstraint('audio', offerConstraintsList) ||
-        this.audioInOfferOptions(offerOptions);
+          ((offerOptions && offerOptions.offerToReceiveAudio) ? 1 : 0);
 
       var numVideoTracks =
           this.countTracksInConstraint('video', offerConstraintsList) ||
-        this.videoInOfferOptions(offerOptions);
+          ((offerOptions && offerOptions.offerToReceiveVideo) ? 1 : 0);
 
       var numDataTracks = this.dataChannels.length;
 
       var numAudioVideoDataTracks = numAudioTracks + numVideoTracks + numDataTracks;
       info("expected audio + video + data tracks: " + numAudioVideoDataTracks);
       is(numAudioVideoDataTracks, numIceConnections, "stats ICE connections matches expected A/V tracks");
     }
   },

new file mode 100644
--- /dev/null
+++ b/dom/media/tests/mochitest/test_peerConnection_bug1064223.html
@@ -0,0 +1,31 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <script type="application/javascript" src="pc.js"></script>
+</head>
+<body>
+<pre id="test">
+<script type="application/javascript">
+  createHTML({
+    bug: "1064223",
+    title: "CreateOffer fails without streams or modern RTCOfferOptions"
+  });
+
+  runNetworkTest(function () {
+    var pc = new mozRTCPeerConnection();
+    var options = { mandatory: { OfferToReceiveVideo: true } }; // obsolete
+
+    pc.createOffer(options).then(() => ok(false, "createOffer must fail"),
+                                 e => is(e.name, "InternalError",
+                                         "createOffer must fail"))
+    .catch(e => ok(false, e.message))
+    .then(() => {
+      pc.close();
+      networkTestFinished();
+    })
+    .catch(e => ok(false, e.message));
+  });
+</script>
+</pre>
+</body>
+</html>

--- a/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveAudio.html
+++ b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveAudio.html
@@ -9,17 +9,15 @@
   createHTML({
     bug: "850275",
     title: "Simple offer media constraint test with audio"
   });
 
   runNetworkTest(function() {
     var test = new PeerConnectionTest();
     test.setMediaConstraints([], [{audio: true}]);
-    // TODO: Stop using old constraint-like RTCOptions soon (Bug 1064223).
-    // Watch out for case-difference when fixing: { offerToReceiveAudio: true }
-    test.setOfferOptions({ mandatory: { OfferToReceiveAudio: true } });
+    test.setOfferOptions({ offerToReceiveAudio: true });
     test.run();
   });
 </script>
 </pre>
 </body>
 </html>

--- a/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideo.html
+++ b/dom/media/tests/mochitest/test_peerConnection_offerRequiresReceiveVideo.html
@@ -9,17 +9,15 @@
   createHTML({
     bug: "850275",
     title: "Simple offer media constraint test with video"
   });
 
   runNetworkTest(function() {
     var test = new PeerConnectionTest();
     test.setMediaConstraints([], [{video: true}]);
-    // TODO: Stop using old constraint-like RTCOptions soon (Bug 1064223).
-    // Watch out for case-difference when fixing: { offerToReceiveVideo: true }
-    test.setOfferOptions({ optional: [{ OfferToReceiveVideo: true }] });
+    test.setOfferOptions({ offerToReceiveVideo: true });
     test.run();
   });
 </script>
 </pre>
 </body>
 </html>