Remove proprietary constructor on AudioContext.

This is a B2G leftover, was proprietary, and is causing issues
because `AudioContext` can now have a parameter that is a property bag,
per spec (we do not do anything with the property bag now; the audio
back-end will use automatic values for everything).

This resolves #924.

dom/media/test/crashtests/1228484.html

@@ -1,13 +0,0 @@
-<!DOCTYPE html>
-<html>
-<head>
-<script>
-
-var htmlAudio = new Audio(URL.createObjectURL(new window.MediaSource()));
-
-(new window.AudioContext("ringer")).createMediaElementSource(htmlAudio);
-(new window.AudioContext("alarm")).createMediaElementSource(htmlAudio);
-
-</script>
-</head>
-</html>

dom/media/test/crashtests/crashtests.list

@@ -81,8 +81,6 @@ load 1157994.html
 load 1158427.html
 load 1185176.html
 load 1185192.html
-load 1223670.html
-load 1228484.html
 load 1304948.html
 load 1319486.html
 load 1291702.html

dom/media/webaudio/AudioContext.cpp

@@ -178,16 +178,6 @@ AudioContext::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
 /* static */ already_AddRefed<AudioContext>
 AudioContext::Constructor(const GlobalObject& aGlobal,
                           ErrorResult& aRv)
-{
-  return AudioContext::Constructor(aGlobal,
-                                   AudioChannelService::GetDefaultAudioChannel(),
-                                   aRv);
-}
-
-/* static */ already_AddRefed<AudioContext>
-AudioContext::Constructor(const GlobalObject& aGlobal,
-                          AudioChannel aChannel,
-                          ErrorResult& aRv)
 {
   nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(aGlobal.GetAsSupports());
   if (!window) {
@@ -195,7 +185,7 @@ AudioContext::Constructor(const GlobalObject& aGlobal,
     return nullptr;
   }
 
-  RefPtr<AudioContext> object = new AudioContext(window, false, aChannel);
+  RefPtr<AudioContext> object = new AudioContext(window, false, AudioChannelService::GetDefaultAudioChannel());
   aRv = object->Init();
   if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;

dom/media/webaudio/AudioContext.h

@@ -151,12 +151,6 @@ public:
   static already_AddRefed<AudioContext>
   Constructor(const GlobalObject& aGlobal, ErrorResult& aRv);
 
-  // Constructor for regular AudioContext. A default audio channel is needed.
-  static already_AddRefed<AudioContext>
-  Constructor(const GlobalObject& aGlobal,
-              AudioChannel aChannel,
-              ErrorResult& aRv);
-
   // Constructor for offline AudioContext
   static already_AddRefed<AudioContext>
   Constructor(const GlobalObject& aGlobal,

dom/webidl/AudioContext.webidl

@@ -24,7 +24,6 @@ dictionary PeriodicWaveConstraints {
 };
 
 [Constructor,
- Constructor(AudioChannel audioChannelType),
  Pref="dom.webaudio.enabled"]
 interface AudioContext : EventTarget {