Cleanup namespace usage from animation to exported in platform/

Source/platform/exported/WebMediaStreamTrackSourcesRequest.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 13 matching lines @@
  */
 
 #include "config.h"
 #include "public/platform/WebMediaStreamTrackSourcesRequest.h"
 
 #include "platform/mediastream/MediaStreamTrackSourcesRequest.h"
 #include "public/platform/WebSourceInfo.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/text/WTFString.h"
 
-using namespace blink;
-
 namespace blink {
 
 namespace {
 
 class ExtraDataContainer : public MediaStreamTrackSourcesRequest::ExtraData {
 public:
     ExtraDataContainer(PassOwnPtr<WebMediaStreamTrackSourcesRequest::ExtraData> extraData) : m_extraData(extraData) { }
 
     WebMediaStreamTrackSourcesRequest::ExtraData* extraData() { return m_extraData.get(); }
 
@@ skipping 38 matching lines @@
     return static_cast<ExtraDataContainer*>(data)->extraData();
 }
 
 void WebMediaStreamTrackSourcesRequest::setExtraData(ExtraData* extraData)
 {
     m_private->setExtraData(adoptPtr(new ExtraDataContainer(adoptPtr(extraData))));
 }
 
 } // namespace blink