Oilpan: Fix build after MIDI changes.

Source/modules/webmidi/MIDIAccess.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 217 matching lines @@
         reject(DOMError::create("SecurityError"));
     }
     return promise;
 }
 
 void MIDIAccess::resolve()
 {
     m_asyncResolveRunner.runAsync();
 }
 
-void MIDIAccess::reject(PassRefPtr<DOMError> error)
+void MIDIAccess::reject(PassRefPtrWillBeRawPtr<DOMError> error)
 {
     m_error = error;
     m_asyncRejectRunner.runAsync();
 }
 
 void MIDIAccess::resolveNow()
 {
     m_resolver->resolve(this, executionContext());
 }
 
 void MIDIAccess::rejectNow()
 {
-    m_resolver->reject(m_error.release().get(), executionContext());
+    m_resolver->reject(m_error.get(), executionContext());
+    m_error.clear();
 }
 
 void MIDIAccess::doPostAction(State state)
 {
     ASSERT(m_state == Requesting);
     ASSERT(state == Resolved || state == Stopped);
     m_error.clear();
     if (state == Stopped) {
         m_accessor.clear();
     }
     m_weakPtrFactory.revokeAll();
     m_state = state;
 }
 
 void MIDIAccess::trace(Visitor* visitor)
 {
     visitor->trace(m_inputs);
     visitor->trace(m_outputs);
+    visitor->trace(m_error);
 }
 
 } // namespace WebCore