WebAudio: Use references instead of pointers in AudioNodeInput and AudioNodeOutput.

Source/modules/webaudio/AudioNodeOutput.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 74 matching lines @@
 private:
     AudioNodeOutput(AudioNode*, unsigned numberOfChannels);
 
     AudioNode* m_node;
 
     friend class AudioNodeInput;
     friend class AudioParam;
 
     // These are called from AudioNodeInput.
     // They must be called with the context's graph lock.
-    void addInput(AudioNodeInput*);
-    void removeInput(AudioNodeInput*);
-    void addParam(AudioParam*);
-    void removeParam(AudioParam*);
+    void addInput(AudioNodeInput&);
+    void removeInput(AudioNodeInput&);
+    void addParam(AudioParam&);
+    void removeParam(AudioParam&);
 
     // fanOutCount() is the number of AudioNodeInputs that we're connected to.
     // This method should not be called in audio thread rendering code, instead renderingFanOutCount() should be used.
     // It must be called with the context's graph lock.
     unsigned fanOutCount();
 
     // Similar to fanOutCount(), paramFanOutCount() is the number of AudioParams that we're connected to.
     // This method should not be called in audio thread rendering code, instead renderingParamFanOutCount() should be used.
     // It must be called with the context's graph lock.
     unsigned paramFanOutCount();
@@ skipping 36 matching lines @@
     // These value should only be changed at the very start or end of the rendering quantum.
     unsigned m_renderingFanOutCount;
     unsigned m_renderingParamFanOutCount;
 
     WillBePersistentHeapHashSet<RefPtrWillBeMember<AudioParam> > m_params;
 };
 
 } // namespace WebCore
 
 #endif // AudioNodeOutput_h