--- a/content/media/webaudio/PannerNode.cpp
+++ b/content/media/webaudio/PannerNode.cpp
@@ -38,19 +38,17 @@ NS_IMPL_ADDREF_INHERITED(PannerNode, Aud
 NS_IMPL_RELEASE_INHERITED(PannerNode, AudioNode)
 
 class PannerNodeEngine : public AudioNodeEngine
 {
 public:
   explicit PannerNodeEngine(AudioNode* aNode)
     : AudioNodeEngine(aNode)
     // Please keep these default values consistent with PannerNode::PannerNode below.
-    , mPanningModel(PanningModelType::HRTF)
     , mPanningModelFunction(&PannerNodeEngine::HRTFPanningFunction)
-    , mDistanceModel(DistanceModelType::Inverse)
     , mDistanceModelFunction(&PannerNodeEngine::InverseGainFunction)
     , mPosition()
     , mOrientation(1., 0., 0.)
     , mVelocity()
     , mRefDistance(1.)
     , mMaxDistance(10000.)
     , mRolloffFactor(1.)
     , mConeInnerAngle(360.)
@@ -66,32 +64,30 @@ public:
       HRTFDatabaseLoader::createAndLoadAsynchronouslyIfNecessary(aNode->Context()->SampleRate());
     mHRTFPanner = new HRTFPanner(aNode->Context()->SampleRate(), loader);
   }
 
   virtual void SetInt32Parameter(uint32_t aIndex, int32_t aParam) MOZ_OVERRIDE
   {
     switch (aIndex) {
     case PannerNode::PANNING_MODEL:
-      mPanningModel = PanningModelType(aParam);
-      switch (mPanningModel) {
+      switch (PanningModelType(aParam)) {
         case PanningModelType::Equalpower:
           mPanningModelFunction = &PannerNodeEngine::EqualPowerPanningFunction;
           break;
         case PanningModelType::HRTF:
           mPanningModelFunction = &PannerNodeEngine::HRTFPanningFunction;
           break;
         default:
           NS_NOTREACHED("We should never see the alternate names here");
           break;
       }
       break;
     case PannerNode::DISTANCE_MODEL:
-      mDistanceModel = DistanceModelType(aParam);
-      switch (mDistanceModel) {
+      switch (DistanceModelType(aParam)) {
         case DistanceModelType::Inverse:
           mDistanceModelFunction = &PannerNodeEngine::InverseGainFunction;
           break;
         case DistanceModelType::Linear:
           mDistanceModelFunction = &PannerNodeEngine::LinearGainFunction;
           break;
         case DistanceModelType::Exponential:
           mDistanceModelFunction = &PannerNodeEngine::ExponentialGainFunction;
@@ -157,20 +153,18 @@ public:
   void EqualPowerPanningFunction(const AudioChunk& aInput, AudioChunk* aOutput);
   void HRTFPanningFunction(const AudioChunk& aInput, AudioChunk* aOutput);
 
   float LinearGainFunction(float aDistance);
   float InverseGainFunction(float aDistance);
   float ExponentialGainFunction(float aDistance);
 
   nsAutoPtr<HRTFPanner> mHRTFPanner;
-  PanningModelType mPanningModel;
   typedef void (PannerNodeEngine::*PanningModelFunction)(const AudioChunk& aInput, AudioChunk* aOutput);
   PanningModelFunction mPanningModelFunction;
-  DistanceModelType mDistanceModel;
   typedef float (PannerNodeEngine::*DistanceModelFunction)(float aDistance);
   DistanceModelFunction mDistanceModelFunction;
   ThreeDPoint mPosition;
   ThreeDPoint mOrientation;
   ThreeDPoint mVelocity;
   double mRefDistance;
   double mMaxDistance;
   double mRolloffFactor;