Oilpan: Allocate all EventTarget derived types on the manged heap.

Source/modules/webaudio/AudioNode.h

 /*
  * 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 34 matching lines @@
 class ExceptionState;
 
 // An AudioNode is the basic building block for handling audio within an AudioContext.
 // It may be an audio source, an intermediate processing module, or an audio destination.
 // Each AudioNode can have inputs and/or outputs. An AudioSourceNode has no inputs and a single output.
 // An AudioDestinationNode has one input and no outputs and represents the final destination to the audio hardware.
 // Most processing nodes such as filters will have one input and one output, although multiple inputs and outputs are possible.
 
 // AudioNode has its own ref-counting mechanism that use RefTypes so we cannot use RefCountedGarbageCollected.
 class AudioNode : public NoBaseWillBeGarbageCollectedFinalized<AudioNode>, public ScriptWrappable, public EventTargetWithInlineData {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioNode);
 public:
     enum { ProcessingSizeInFrames = 128 };
 
     AudioNode(AudioContext*, float sampleRate);
     virtual ~AudioNode();
 
     AudioContext* context() { return m_context.get(); }
     const AudioContext* context() const { return m_context.get(); }
 
     enum NodeType {
@@ skipping 108 matching lines @@
     String channelInterpretation();
     void setChannelInterpretation(const String&, ExceptionState&);
 
     ChannelCountMode internalChannelCountMode() const { return m_channelCountMode; }
     AudioBus::ChannelInterpretation internalChannelInterpretation() const { return m_channelInterpretation; }
 
     // EventTarget
     virtual const AtomicString& interfaceName() const OVERRIDE FINAL;
     virtual ExecutionContext* executionContext() const OVERRIDE FINAL;
 
-    virtual void trace(Visitor*);
+    virtual void trace(Visitor*) OVERRIDE;
 
 #if ENABLE(OILPAN)
     void clearKeepAlive();
 #endif
 
 protected:
     // Inputs and outputs must be created before the AudioNode is initialized.
     void addInput(PassOwnPtr<AudioNodeInput>);
     void addOutput(PassOwnPtr<AudioNodeOutput>);
 
@@ skipping 45 matching lines @@
 
 protected:
     unsigned m_channelCount;
     ChannelCountMode m_channelCountMode;
     AudioBus::ChannelInterpretation m_channelInterpretation;
 };
 
 } // namespace WebCore
 
 #endif // AudioNode_h