Connecting webrtc-internals WebUI frontend with the backend

chrome/browser/media/webrtc_internals_ui_observer.h

 // 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.
 
-#ifndef CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_UI_OBSERVER_H_
-#define CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_UI_OBSERVER_H_
+#ifndef CHROME_BROWSER_MEDIA_WEBRTC_INTERNALS_UI_OBSERVER_H_
+#define CHROME_BROWSER_MEDIA_WEBRTC_INTERNALS_UI_OBSERVER_H_
+
+#include <string>
 
 namespace base {
 class Value;
 }  // namespace base
 
-namespace content {
-
 // Implement this interface to receive WebRTCInternals updates.
 class WebRTCInternalsUIObserver {
  public:
   virtual ~WebRTCInternalsUIObserver() {}
 
   // This is called on the browser IO thread.
   virtual void OnUpdate(const std::string& command,
                         const base::Value* args) = 0;
 };
 
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_WEBRTC_INTERNALS_UI_OBSERVER_H_
+#endif  // CHROME_BROWSER_MEDIA_WEBRTC_INTERNALS_UI_OBSERVER_H_