Change FrameTreeNode id from int64 to int.

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_FRAME_HOST_FRAME_TREE_H_
 #define CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 36 matching lines @@
             RenderFrameHostDelegate* render_frame_delegate,
             RenderViewHostDelegate* render_view_delegate,
             RenderWidgetHostDelegate* render_widget_delegate,
             RenderFrameHostManager::Delegate* manager_delegate);
   ~FrameTree();
 
   FrameTreeNode* root() const { return root_.get(); }
 
   // Returns the FrameTreeNode with the given |frame_tree_node_id| if it is part
   // of this FrameTree.
-  FrameTreeNode* FindByID(int64 frame_tree_node_id);
+  FrameTreeNode* FindByID(int frame_tree_node_id);
 
   // Returns the FrameTreeNode with the given renderer-specific |routing_id|.
   FrameTreeNode* FindByRoutingID(int process_id, int routing_id);
 
   // Returns the first frame in this tree with the given |name|, or the main
   // frame if |name| is empty.
   // Note that this does NOT support pseudo-names like _self, _top, and _blank,
   // nor searching other FrameTrees (unlike blink::WebView::findFrameByName).
   FrameTreeNode* FindByName(const std::string& name);
 
@@ skipping 102 matching lines @@
 
   // Map of SiteInstance ID to RenderViewHosts that are pending shutdown. The
   // renderers of these RVH are currently executing the unload event in
   // background. When the SwapOutACK is received, they will be deleted. In the
   // meantime, they are kept in this map, as they should not be reused (part of
   // their state is already gone away).
   RenderViewHostMultiMap render_view_host_pending_shutdown_map_;
 
   scoped_ptr<FrameTreeNode> root_;
 
-  int64 focused_frame_tree_node_id_;
+  int focused_frame_tree_node_id_;
 
   base::Callback<void(RenderFrameHost*)> on_frame_removed_;
 
   // Overall load progress.
   double load_progress_;
 
   DISALLOW_COPY_AND_ASSIGN(FrameTree);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_FRAME_TREE_H_