Get rid of custom bindings for AudioBufferSourceNode.buffer setter

Source/modules/webaudio/AudioBufferSourceNode.h

Index: Source/modules/webaudio/AudioBufferSourceNode.h
diff --git a/Source/modules/webaudio/AudioBufferSourceNode.h b/Source/modules/webaudio/AudioBufferSourceNode.h
index 60bc1be80ef36f8d97cacb64b7d5defac904afe6..77cea02d66913dbc673575b267e17c65a218189f 100644
--- a/Source/modules/webaudio/AudioBufferSourceNode.h
+++ b/Source/modules/webaudio/AudioBufferSourceNode.h
@@ -52,9 +52,8 @@ public:
     virtual void process(size_t framesToProcess);
     virtual void reset();
 
-    // setBuffer() is called on the main thread.  This is the buffer we use for playback.
-    // returns true on success.
-    bool setBuffer(AudioBuffer*);
+    // setBuffer() is called on the main thread. This is the buffer we use for playback.
+    void setBuffer(AudioBuffer*, ExceptionState&);
     AudioBuffer* buffer() { return m_buffer.get(); }
 
     // numberOfChannels() returns the number of output channels.  This value equals the number of channels from the buffer.