Oilpan: move MediaKeyError to the heap.

Source/bindings/v8/Dictionary.cpp

 /*
  * 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
@@ skipping 440 matching lines @@
 bool Dictionary::get(const String& key, RefPtrWillBeMember<MIDIPort>& value) const
 {
     v8::Local<v8::Value> v8Value;
     if (!getKey(key, v8Value))
         return false;
 
     value = V8MIDIPort::toNativeWithTypeCheck(m_isolate, v8Value);
     return true;
 }
 
-bool Dictionary::get(const String& key, RefPtr<MediaKeyError>& value) const
+bool Dictionary::get(const String& key, RefPtrWillBeMember<MediaKeyError>& value) const
 {
     v8::Local<v8::Value> v8Value;
     if (!getKey(key, v8Value))
         return false;
 
     value = V8MediaKeyError::toNativeWithTypeCheck(m_isolate, v8Value);
     return true;
 }
 
 bool Dictionary::get(const String& key, RefPtrWillBeMember<TrackBase>& value) const
@@ skipping 274 matching lines @@
 
     return *this;
 }
 
 void Dictionary::ConversionContext::throwTypeError(const String& detail)
 {
     exceptionState().throwTypeError(detail);
 }
 
 } // namespace WebCore