--- a/content/media/gtest/TestWebMWriter.cpp
+++ b/content/media/gtest/TestWebMWriter.cpp
@@ -235,18 +235,17 @@ struct WebMioData {
 
 static int webm_read(void* aBuffer, size_t aLength, void* aUserData)
 {
   NS_ASSERTION(aUserData, "aUserData must point to a valid WebMioData");
   WebMioData* ioData = static_cast<WebMioData*>(aUserData);
 
   // Check the read length.
   if (aLength > ioData->data.Length()) {
-    NS_ERROR("Invalid read length");
-    return -1;
+    return 0;
   }
 
   // Check eos.
   if (ioData->offset.value() >= ioData->data.Length()) {
     return 0;
   }
 
   size_t oldOffset = ioData->offset.value();
@@ -287,17 +286,17 @@ static int webm_seek(int64_t aOffset, in
       return -1;
   }
 
   if (!ioData->offset.isValid()) {
     NS_ERROR("Invalid offset");
     return -1;
   }
 
-  return 1;
+  return 0;
 }
 
 static int64_t webm_tell(void* aUserData)
 {
   NS_ASSERTION(aUserData, "aUserData must point to a valid WebMioData");
   WebMioData* ioData = static_cast<WebMioData*>(aUserData);
   return ioData->offset.isValid() ? ioData->offset.value() : -1;
 }

old mode 100644
new mode 100755