Revert "Transition modules/** to use ExceptionState"

Source/modules/mediasource/MediaSource.h

Index: Source/modules/mediasource/MediaSource.h
diff --git a/Source/modules/mediasource/MediaSource.h b/Source/modules/mediasource/MediaSource.h
index 962722fee63c61adf5a45a7fae63ac2aaa6d9375..10dcd756a47a6167f926c16ff88e5d3466b28b7b 100644
--- a/Source/modules/mediasource/MediaSource.h
+++ b/Source/modules/mediasource/MediaSource.h
@@ -39,8 +39,6 @@
 
 namespace WebCore {
 
-class ExceptionState;
-
 class MediaSource : public MediaSourceBase, public ScriptWrappable {
 public:
     static PassRefPtr<MediaSource> create(ScriptExecutionContext*);
@@ -49,8 +47,8 @@ public:
     // MediaSource.idl methods
     SourceBufferList* sourceBuffers() { return m_sourceBuffers.get(); }
     SourceBufferList* activeSourceBuffers() { return m_activeSourceBuffers.get(); }
-    SourceBuffer* addSourceBuffer(const String& type, ExceptionState&);
-    void removeSourceBuffer(SourceBuffer*, ExceptionState&);
+    SourceBuffer* addSourceBuffer(const String& type, ExceptionCode&);
+    void removeSourceBuffer(SourceBuffer*, ExceptionCode&);
     static bool isTypeSupported(const String& type);
 
     // EventTarget interface