Revert of Apply AllowCrossThreadAccess() in the callers of createCrossThreadTask()

third_party/WebKit/Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 44 matching lines @@
 {
     return m_executionContext->getSecurityOrigin()->isolatedCopy();
 }
 
 void MediaStreamTrackSourcesRequestImpl::requestSucceeded(const WebVector<WebSourceInfo>& webSourceInfos)
 {
     DCHECK(m_callback);
 
     for (size_t i = 0; i < webSourceInfos.size(); ++i)
         m_sourceInfos.append(SourceInfo::create(webSourceInfos[i]));
-    m_executionContext->postTask(BLINK_FROM_HERE, createCrossThreadTask(&MediaStreamTrackSourcesRequestImpl::performCallback, AllowCrossThreadAccess(this)));
+    m_executionContext->postTask(BLINK_FROM_HERE, createCrossThreadTask(&MediaStreamTrackSourcesRequestImpl::performCallback, this));
 }
 
 void MediaStreamTrackSourcesRequestImpl::performCallback()
 {
     m_callback->handleEvent(m_sourceInfos);
     m_callback.clear();
 }
 
 DEFINE_TRACE(MediaStreamTrackSourcesRequestImpl)
 {
     visitor->trace(m_callback);
     visitor->trace(m_executionContext);
     visitor->trace(m_sourceInfos);
     MediaStreamTrackSourcesRequest::trace(visitor);
 }
 
 } // namespace blink