Decouple performance() from LocalDOMWindow

Source/modules/mediasource/VideoPlaybackQuality.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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "modules/mediasource/VideoPlaybackQuality.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalDOMWindow.h"
+#include "core/timing/DOMWindowPerformance.h"
 #include "core/timing/Performance.h"
 
 namespace blink {
 
 VideoPlaybackQuality* VideoPlaybackQuality::create(
     const Document& document, unsigned totalVideoFrames, unsigned droppedVideoFrames, unsigned corruptedVideoFrames)
 {
     return new VideoPlaybackQuality(document, totalVideoFrames, droppedVideoFrames, corruptedVideoFrames);
 }
 
 VideoPlaybackQuality::VideoPlaybackQuality(
     const Document& document, unsigned totalVideoFrames, unsigned droppedVideoFrames, unsigned corruptedVideoFrames)
     : m_creationTime(0)
     , m_totalVideoFrames(totalVideoFrames)
     , m_droppedVideoFrames(droppedVideoFrames)
     , m_corruptedVideoFrames(corruptedVideoFrames)
 {
     if (document.domWindow())
-        m_creationTime = document.domWindow()->performance()->now();
+        m_creationTime = DOMWindowPerformance::performance(*(document.domWindow()))->now();
 }
 
 }