Delete obviously unneeded forward declarations in chrome/browser/*.h.

chrome/browser/repost_form_warning_controller.h

 // Copyright (c) 2010 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 CHROME_BROWSER_REPOST_FORM_WARNING_CONTROLLER_H_
 #define CHROME_BROWSER_REPOST_FORM_WARNING_CONTROLLER_H_
 #pragma once
 
 #include "chrome/browser/tab_contents/constrained_window.h"
 #include "chrome/common/notification_registrar.h"
 
-class NavigationController;
 class TabContents;
 
 // This class is used to continue or cancel a pending reload when the
 // repost form warning is shown. It is owned by the platform-dependent
 // |RepostFormWarning{Gtk,Mac,View}| classes.
 class RepostFormWarningController : public NotificationObserver {
  public:
   explicit RepostFormWarningController(TabContents* tab_contents);
   virtual ~RepostFormWarningController();
 
@@ skipping 20 matching lines @@
 
   // Tab contents, used to continue the reload.
   TabContents* tab_contents_;
 
   ConstrainedWindow* window_;
 
   DISALLOW_COPY_AND_ASSIGN(RepostFormWarningController);
 };
 
 #endif  // CHROME_BROWSER_REPOST_FORM_WARNING_CONTROLLER_H_