Bug 1580659 - part1 : use AudioChannelAgent directly. r=chunmin

`nsIAudioChannelAgent` was created a common interface for a usage of in both js and C++ before, now we have no any JS code would use `nsIAudioChannelAgent`, it's only used in C++ code.

Therefore, in a coming refactoring (bug1580662), we will remove `nsIAudioChannelAgent` and use `AudioChannelAgent` as the only interface. Here we can make these classes start to reference `AudioChannelAgent`, instead of `nsIAudioChannelAgent`.

Differential Revision: https://phabricator.services.mozilla.com/D45748

--HG--
extra : moz-landing-system : lando

dom/media/webaudio/AudioDestinationNode.cpp

@@ -13,7 +13,6 @@
 #include "mozilla/dom/OfflineAudioCompletionEvent.h"
 #include "mozilla/dom/ScriptSettings.h"
 #include "mozilla/dom/BaseAudioContextBinding.h"
-#include "AudioChannelAgent.h"
 #include "AudioChannelService.h"
 #include "AudioNodeEngine.h"
 #include "AudioNodeStream.h"

dom/media/webaudio/AudioDestinationNode.h

@@ -9,7 +9,7 @@
 
 #include "AudioChannelService.h"
 #include "AudioNode.h"
-#include "nsIAudioChannelAgent.h"
+#include "AudioChannelAgent.h"
 #include "mozilla/TimeStamp.h"
 
 namespace mozilla {
@@ -80,7 +80,7 @@ class AudioDestinationNode final : public AudioNode,
   SelfReference<AudioDestinationNode> mOfflineRenderingRef;
   uint32_t mFramesToProduce;
 
-  nsCOMPtr<nsIAudioChannelAgent> mAudioChannelAgent;
+  RefPtr<AudioChannelAgent> mAudioChannelAgent;
   RefPtr<MediaInputPort> mCaptureStreamPort;
 
   RefPtr<Promise> mOfflineRenderingPromise;

dom/media/webspeech/synth/nsSpeechTask.cpp

@@ -4,7 +4,6 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#include "AudioChannelAgent.h"
 #include "AudioChannelService.h"
 #include "AudioSegment.h"
 #include "nsSpeechTask.h"

dom/media/webspeech/synth/nsSpeechTask.h

@@ -8,7 +8,7 @@
 #define mozilla_dom_nsSpeechTask_h
 
 #include "SpeechSynthesisUtterance.h"
-#include "nsIAudioChannelAgent.h"
+#include "AudioChannelAgent.h"
 #include "nsISpeechService.h"
 
 namespace mozilla {
@@ -109,7 +109,7 @@ class nsSpeechTask : public nsISpeechTask,
 
   nsCOMPtr<nsISpeechTaskCallback> mCallback;
 
-  nsCOMPtr<nsIAudioChannelAgent> mAudioChannelAgent;
+  RefPtr<mozilla::dom::AudioChannelAgent> mAudioChannelAgent;
 
   RefPtr<SpeechSynthesis> mSpeechSynthesis;
 

dom/plugins/base/nsNPAPIPluginInstance.cpp

@@ -34,7 +34,6 @@
 #include "nsILoadContext.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/HTMLObjectElementBinding.h"
-#include "AudioChannelAgent.h"
 #include "AudioChannelService.h"
 
 using namespace mozilla;

dom/plugins/base/nsNPAPIPluginInstance.h

@@ -17,7 +17,7 @@
 #include "nsHashKeys.h"
 #include <prinrval.h>
 #include "js/TypeDecls.h"
-#include "nsIAudioChannelAgent.h"
+#include "AudioChannelAgent.h"
 
 #include "mozilla/EventForwards.h"
 #include "mozilla/TimeStamp.h"
@@ -297,7 +297,7 @@ class nsNPAPIPluginInstance final
   char** mCachedParamNames;
   char** mCachedParamValues;
 
-  nsCOMPtr<nsIAudioChannelAgent> mAudioChannelAgent;
+  RefPtr<mozilla::dom::AudioChannelAgent> mAudioChannelAgent;
   bool mMuted;
 };