Oilpan: Use transition types for HTMLMediaElement and make AudioSourceProviderClient a GC mixin.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 3039 matching lines @@
 }
 
 void WebViewImpl::performMediaPlayerAction(const WebMediaPlayerAction& action,
                                            const WebPoint& location)
 {
     HitTestResult result = hitTestResultForWindowPos(location);
     RefPtr<Node> node = result.innerNonSharedNode();
     if (!isHTMLVideoElement(*node) && !isHTMLAudioElement(*node))
         return;
 
-    RefPtr<HTMLMediaElement> mediaElement =
-        static_pointer_cast<HTMLMediaElement>(node);
+    RefPtrWillBeRawPtr<HTMLMediaElement> mediaElement =
+        static_cast<HTMLMediaElement*>(node.get());
     switch (action.type) {
     case WebMediaPlayerAction::Play:
         if (action.enable)
             mediaElement->play();
         else
             mediaElement->pause();
         break;
     case WebMediaPlayerAction::Mute:
         mediaElement->setMuted(action.enable);
         break;
@@ skipping 1003 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink