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

Source/modules/webaudio/AudioNodeInput.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 24 matching lines @@
 
 class AudioNode;
 class AudioNodeOutput;
 
 // An AudioNodeInput represents an input to an AudioNode and can be connected from one or more AudioNodeOutputs.
 // In the case of multiple connections, the input will act as a unity-gain summing junction, mixing all the outputs.
 // The number of channels of the input's bus is the maximum of the number of channels of all its connections.
 
 class AudioNodeInput FINAL : public AudioSummingJunction {
 public:
-    static PassOwnPtr<AudioNodeInput> create(AudioNode*);
+    static PassOwnPtr<AudioNodeInput> create(AudioNode&);
 
     // AudioSummingJunction
-    virtual bool canUpdateState() OVERRIDE { return !node()->isMarkedForDeletion(); }
+    virtual bool canUpdateState() OVERRIDE { return !node().isMarkedForDeletion(); }
     virtual void didUpdate() OVERRIDE;
 
     // Can be called from any thread.
-    AudioNode* node() const { return m_node; }
+    AudioNode& node() const { return m_node; }
 
     // Must be called with the context's graph lock.
-    void connect(AudioNodeOutput*);
-    void disconnect(AudioNodeOutput*);
+    void connect(AudioNodeOutput&);
+    void disconnect(AudioNodeOutput&);
 
     // disable() will take the output out of the active connections list and set aside in a disabled list.
     // enable() will put the output back into the active connections list.
     // Must be called with the context's graph lock.
-    void enable(AudioNodeOutput*);
-    void disable(AudioNodeOutput*);
+    void enable(AudioNodeOutput&);
+    void disable(AudioNodeOutput&);
 
     // pull() processes all of the AudioNodes connected to us.
     // In the case of multiple connections it sums the result into an internal summing bus.
     // In the single connection case, it allows in-place processing where possible using inPlaceBus.
     // It returns the bus which it rendered into, returning inPlaceBus if in-place processing was performed.
     // Called from context's audio thread.
     AudioBus* pull(AudioBus* inPlaceBus, size_t framesToProcess);
 
     // bus() contains the rendered audio after pull() has been called for each time quantum.
     // Called from context's audio thread.
     AudioBus* bus();
 
     // updateInternalBus() updates m_internalSummingBus appropriately for the number of channels.
     // This must be called when we own the context's graph lock in the audio thread at the very start or end of the render quantum.
     void updateInternalBus();
 
     // The number of channels of the connection with the largest number of channels.
     unsigned numberOfChannels() const;
 
 private:
-    explicit AudioNodeInput(AudioNode*);
+    explicit AudioNodeInput(AudioNode&);
 
-    AudioNode* m_node;
+    AudioNode& m_node;
 
     // m_disabledOutputs contains the AudioNodeOutputs which are disabled (will not be processed) by the audio graph rendering.
     // But, from JavaScript's perspective, these outputs are still connected to us.
     // Generally, these represent disabled connections from "notes" which have finished playing but are not yet garbage collected.
     HashSet<AudioNodeOutput*> m_disabledOutputs;
 
     // Called from context's audio thread.
     AudioBus* internalSummingBus();
     void sumAllConnections(AudioBus* summingBus, size_t framesToProcess);
 
     RefPtr<AudioBus> m_internalSummingBus;
 };
 
 } // namespace WebCore
 
 #endif // AudioNodeInput_h