Cleanup namespace usage from animation to exported in platform/

Source/platform/exported/WebRTCOfferOptions.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "public/platform/WebRTCOfferOptions.h"
 
 #include "platform/mediastream/RTCOfferOptions.h"
 
-using namespace blink;
-
 namespace blink {
 
 WebRTCOfferOptions::WebRTCOfferOptions(const PassRefPtr<RTCOfferOptions>& options)
     : m_private(options)
 {
 }
 
 void WebRTCOfferOptions::assign(const WebRTCOfferOptions& other)
 {
     m_private = other.m_private;
@@ skipping 22 matching lines @@
     return m_private->voiceActivityDetection();
 }
 
 bool WebRTCOfferOptions::iceRestart() const
 {
     ASSERT(!isNull());
     return m_private->iceRestart();
 }
 
 } // namespace blink