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

content/renderer/media/mock_media_stream_registry.cc

 // Copyright (c) 2013 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_media_stream_registry.h"
 
 #include <string>
 
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/libjingle/source/talk/media/base/videocapturer.h"
 
 namespace content {
 
 static const std::string kTestStreamLabel = "stream_label";
 
@@ skipping 25 matching lines @@
     return WebKit::WebMediaStream();
   }
   return test_stream_;
 }
 
 const WebKit::WebMediaStream MockMediaStreamRegistry::test_stream() const {
   return test_stream_;
 }
 
 }  // namespace content