Revert "Transition modules/** to use ExceptionState"

Source/modules/webaudio/AudioBuffer.h

Index: Source/modules/webaudio/AudioBuffer.h
diff --git a/Source/modules/webaudio/AudioBuffer.h b/Source/modules/webaudio/AudioBuffer.h
index ca4b16c5d48cdd9d9bc051cfe54d801403db5c29..bfd50266e24a31120dce067b88478e05c5c0ac2b 100644
--- a/Source/modules/webaudio/AudioBuffer.h
+++ b/Source/modules/webaudio/AudioBuffer.h
@@ -39,7 +39,8 @@
 namespace WebCore {
 
 class AudioBus;
-class ExceptionState;
+
+typedef int ExceptionCode;
 
 class AudioBuffer : public ScriptWrappable, public RefCounted<AudioBuffer> {
 public:
@@ -55,7 +56,8 @@ public:
 
     // Channel data access
     unsigned numberOfChannels() const { return m_channels.size(); }
-    PassRefPtr<Float32Array> getChannelData(unsigned channelIndex, ExceptionState&);
+    PassRefPtr<Float32Array> getChannelData(unsigned channelIndex, ExceptionCode&);
+
     Float32Array* getChannelData(unsigned channelIndex);
     void zero();