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

content/browser/frame_host/frame_tree.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_FRAME_TREE_H_
-#define CONTENT_BROWSER_RENDERER_HOST_FRAME_TREE_H_
+#ifndef CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_
+#define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
-#include "content/browser/renderer_host/frame_tree_node.h"
+#include "content/browser/frame_host/frame_tree_node.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class FrameTreeNode;
 class RenderProcessHost;
 class RenderViewHostImpl;
 
 // Represents the frame tree for a page. With the exception of the main frame,
 // all FrameTreeNodes will be created/deleted in response to frame attach and
@@ skipping 70 matching lines @@
 
   scoped_ptr<FrameTreeNode> root_;
 
   base::Callback<void(RenderViewHostImpl*, int64)> on_frame_removed_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTree);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_BROWSER_RENDERER_HOST_FRAME_TREE_H_
+#endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_