Change FrameTreeNode id from int64 to int.

content/public/browser/navigation_controller.h

 // Copyright (c) 2012 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_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_
 #define CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 109 matching lines @@
     scoped_refptr<SiteInstance> source_site_instance;
 
     // See LoadURLType comments above.
     LoadURLType load_type;
 
     // PageTransition for this load. See PageTransition for details.
     // Note the default value in constructor below.
     ui::PageTransition transition_type;
 
     // The FrameTreeNode ID for the frame to navigate, or -1 for the main frame.
-    int64 frame_tree_node_id;
+    int frame_tree_node_id;
 
     // Referrer for this load. Empty if none.
     Referrer referrer;
 
     // Any redirect URLs that occurred for this navigation before |url|.
     // Defaults to an empty vector.
     std::vector<GURL> redirect_chain;
 
     // Extra headers for this load, separated by \n.
     std::string extra_headers;
@@ skipping 322 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class NavigationControllerImpl;
   NavigationController() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_NAVIGATION_CONTROLLER_H_