Cleanup namespace usage from animation to exported in platform/

Source/platform/exported/WebRTCSessionDescriptionRequest.cpp

 /*
  * Copyright (C) 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 18 matching lines @@
  */
 
 #include "config.h"
 
 #include "public/platform/WebRTCSessionDescriptionRequest.h"
 
 #include "platform/mediastream/RTCSessionDescriptionRequest.h"
 #include "public/platform/WebRTCSessionDescription.h"
 #include "wtf/PassOwnPtr.h"
 
-using namespace blink;
-
 namespace blink {
 
 namespace {
 
 class ExtraDataContainer : public RTCSessionDescriptionRequest::ExtraData {
 public:
     ExtraDataContainer(PassOwnPtr<WebRTCSessionDescriptionRequest::ExtraData> extraData) : m_extraData(extraData) { }
 
     WebRTCSessionDescriptionRequest::ExtraData* extraData() { return m_extraData.get(); }
 
@@ skipping 38 matching lines @@
     return static_cast<ExtraDataContainer*>(data)->extraData();
 }
 
 void WebRTCSessionDescriptionRequest::setExtraData(ExtraData* extraData)
 {
     m_private->setExtraData(adoptPtr(new ExtraDataContainer(adoptPtr(extraData))));
 }
 
 } // namespace blink