Split "Online" and "Offline" AudioContext processing

Source/modules/webaudio/MediaStreamAudioSourceNode.h

Index: Source/modules/webaudio/MediaStreamAudioSourceNode.h
diff --git a/Source/modules/webaudio/MediaStreamAudioSourceNode.h b/Source/modules/webaudio/MediaStreamAudioSourceNode.h
index 4896d5d6338aa879de67a9f6dd959a4bea56721a..83d70cc9897c76126e6a5cff26f8bc3d9d856d5c 100644
--- a/Source/modules/webaudio/MediaStreamAudioSourceNode.h
+++ b/Source/modules/webaudio/MediaStreamAudioSourceNode.h
@@ -37,7 +37,7 @@
 
 namespace blink {
 
-class AudioContext;
+class AbstractAudioContext;
 
 class MediaStreamAudioSourceHandler final : public AudioHandler {
 public:
@@ -75,7 +75,7 @@ class MediaStreamAudioSourceNode final : public AudioSourceNode, public AudioSou
     DEFINE_WRAPPERTYPEINFO();
     USING_GARBAGE_COLLECTED_MIXIN(MediaStreamAudioSourceNode);
 public:
-    static MediaStreamAudioSourceNode* create(AudioContext&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
+    static MediaStreamAudioSourceNode* create(AbstractAudioContext&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
     DECLARE_VIRTUAL_TRACE();
     MediaStreamAudioSourceHandler& mediaStreamAudioSourceHandler() const;
 
@@ -85,7 +85,7 @@ public:
     void setFormat(size_t numberOfChannels, float sampleRate) override;
 
 private:
-    MediaStreamAudioSourceNode(AudioContext&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
+    MediaStreamAudioSourceNode(AbstractAudioContext&, MediaStream&, MediaStreamTrack*, PassOwnPtr<AudioSourceProvider>);
 };
 
 } // namespace blink