Move mediastream module to oilpan transition types

Source/modules/webaudio/AudioContext.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 355 matching lines @@
 
     MediaStreamTrackVector audioTracks = mediaStream->getAudioTracks();
     if (audioTracks.isEmpty()) {
         exceptionState.throwDOMException(
             InvalidStateError,
             "MediaStream has no audio track");
         return nullptr;
     }
 
     // Use the first audio track in the media stream.
-    RefPtr<MediaStreamTrack> audioTrack = audioTracks[0];
+    RefPtrWillBeRawPtr<MediaStreamTrack> audioTrack = audioTracks[0];
     OwnPtr<AudioSourceProvider> provider = audioTrack->createWebAudioSource();
     RefPtr<MediaStreamAudioSourceNode> node = MediaStreamAudioSourceNode::create(this, mediaStream, audioTrack.get(), provider.release());
 
     // FIXME: Only stereo streams are supported right now. We should be able to accept multi-channel streams.
     node->setFormat(2, sampleRate());
 
     refNode(node.get()); // context keeps reference until node is disconnected
     return node;
 }
 
@@ skipping 593 matching lines @@
     // Avoid firing the event if the document has already gone away.
     if (executionContext()) {
         // Call the offline rendering completion event listener.
         dispatchEvent(OfflineAudioCompletionEvent::create(renderedBuffer));
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)