Drop unused base/tuple.h inclusion

content/browser/frame_host/navigator_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_FRAME_HOST_NAVIGATOR_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time/time.h"
-#include "base/tuple.h"
 #include "content/browser/frame_host/navigation_controller_impl.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/common/content_export.h"
 #include "url/gurl.h"
 
 class GURL;
 struct FrameMsg_Navigate_Params;
 
 namespace content {
 
@@ skipping 113 matching lines @@
   // different FrameTreeNodes, based on the frame_tree_node_id.
   typedef base::ScopedPtrHashMap<int64, NavigationRequest> NavigationRequestMap;
   NavigationRequestMap navigation_request_map_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigatorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_