Use a direct include of utf_string_conversions.h in content/.

content/renderer/media/mock_web_rtc_peer_connection_handler_client.cc

 // Copyright (c) 2012 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 "content/renderer/media/mock_web_rtc_peer_connection_handler_client.h"
 
 #include "base/logging.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebMediaStream.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 using testing::_;
 
 namespace content {
 
 MockWebRTCPeerConnectionHandlerClient::
 MockWebRTCPeerConnectionHandlerClient()
     : candidate_mline_index_(-1) {
@@ skipping 28 matching lines @@
     const WebKit::WebMediaStream& stream_descriptor) {
   remote_steam_ = stream_descriptor;
 }
 
 void MockWebRTCPeerConnectionHandlerClient::didRemoveRemoteStreamWorker(
     const WebKit::WebMediaStream& stream_descriptor) {
   remote_steam_.reset();
 }
 
 }  // namespace content