Don't invoke load algorithm when a media element is moved into a new document.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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 527 matching lines @@
 
   removeElementFromDocumentMap(this, &oldDocument);
   addElementToDocumentMap(this, &document());
 
   // FIXME: This is a temporary fix to prevent this object from causing the
   // MediaPlayer to dereference LocalFrame and FrameLoader pointers from the
   // previous document. This restarts the load, as if the src attribute had been
   // set.  A proper fix would provide a mechanism to allow this object to
   // refresh the MediaPlayer's LocalFrame and FrameLoader references on document
   // changes so that playback can be resumed properly.
-  m_ignorePreloadNone = false;
-  invokeLoadAlgorithm();
+  // m_ignorePreloadNone = false;
+  // invokeLoadAlgorithm();
 
   // Decrement the load event delay count on oldDocument now that
   // m_webMediaPlayer has been destroyed and there is no risk of dispatching a
   // load event from within the destructor.
   oldDocument.decrementLoadEventDelayCount();
 
   ActiveDOMObject::didMoveToNewExecutionContext(&document());
   HTMLElement::didMoveToNewDocument(oldDocument);
 }
 
@@ skipping 3527 matching lines @@
 
 IntRect HTMLMediaElement::AutoplayHelperClientImpl::absoluteBoundingBoxRect()
     const {
   IntRect result;
   if (LayoutObject* object = m_element->layoutObject())
     result = object->absoluteBoundingBoxRect();
   return result;
 }
 
 }  // namespace blink