Move navigation and frame tree classes to a new frame_host/ directory.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 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_RENDERER_HOST_RENDER_FRAME_HOST_IMPL_H_
-#define CONTENT_BROWSER_RENDERER_HOST_RENDER_FRAME_HOST_IMPL_H_
+#ifndef CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
+#define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/render_frame_host.h"
 
 class GURL;
 
 namespace content {
 
@@ skipping 50 matching lines @@
   // messages from the renderer requesting DOM manipulation.
   FrameTree* frame_tree_;
   int routing_id_;
   bool is_swapped_out_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_FRAME_HOST_IMPL_H_
+#endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_