ConvolverNode.buffer sample rate must match AudioContext rate

Source/modules/webaudio/ConvolverNode.h

Index: Source/modules/webaudio/ConvolverNode.h
diff --git a/Source/modules/webaudio/ConvolverNode.h b/Source/modules/webaudio/ConvolverNode.h
index 083b9f2e39c58e03d38c83a6d2d066f2b2bba312..e135a0187b296646ebadae9a6d51813bee7a4013 100644
--- a/Source/modules/webaudio/ConvolverNode.h
+++ b/Source/modules/webaudio/ConvolverNode.h
@@ -33,6 +33,7 @@
 namespace WebCore {
 
 class AudioBuffer;
+class ExceptionState;
 class Reverb;
 
 class ConvolverNode FINAL : public AudioNode {
@@ -50,7 +51,7 @@ public:
     virtual void uninitialize() OVERRIDE;
 
     // Impulse responses
-    void setBuffer(AudioBuffer*);
+    void setBuffer(AudioBuffer*, ExceptionState&);
     AudioBuffer* buffer();
 
     bool normalize() const { return m_normalize; }