Move RenderViewHostObserver to content/public/browser/ and put it into the content namespace.

content/public/browser/render_view_host_observer.h

 // Copyright (c) 2011 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_RENDERER_HOST_RENDER_VIEW_HOST_OBSERVER_H_
-#define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_OBSERVER_H_
+#ifndef CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_OBSERVER_H_
+#define CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_OBSERVER_H_
+#pragma once
 
 #include "ipc/ipc_channel.h"
 #include "content/common/content_export.h"
 
 class GURL;
 class RenderViewHost;
 
+namespace content {
+
 // An observer API implemented by classes which want to filter IPC messages from
 // RenderViewHost.
 class CONTENT_EXPORT RenderViewHostObserver : public IPC::Channel::Listener,
                                               public IPC::Message::Sender {
  public:
 
  protected:
   explicit RenderViewHostObserver(RenderViewHost* render_view_host);
 
   virtual ~RenderViewHostObserver();
@@ skipping 14 matching lines @@
   // IPC::Channel::Listener implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC::Message::Sender implementation.
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
   RenderViewHost* render_view_host() const { return render_view_host_; }
   int routing_id() { return routing_id_; }
 
  private:
-  friend class RenderViewHost;
+  friend class ::RenderViewHost;
 
   // Invoked from RenderViewHost. Invokes RenderViewHostDestroyed and NULL out
   // |render_view_host_|.
   void RenderViewHostDestruction();
 
   RenderViewHost* render_view_host_;
 
   // The routing ID of the associated RenderViewHost.
   int routing_id_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostObserver);
 };
 
-#endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_OBSERVER_H_
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_RENDER_VIEW_HOST_OBSERVER_H_