Cleanup: Remove forward declarations in various chrome/browser directories.

chrome/browser/ui/touch/tabs/touch_tab_strip.h

 // Copyright (c) 2011 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_UI_TOUCH_TABS_TOUCH_TAB_STRIP_H_
 #define CHROME_BROWSER_UI_TOUCH_TABS_TOUCH_TAB_STRIP_H_
 #pragma once
 
 #include "chrome/browser/ui/views/tabs/tab_strip.h"
 
 namespace ui {
 enum TouchStatus;
 }
 
-class TabStripSelectionModel;
 class TouchTab;
 
 ///////////////////////////////////////////////////////////////////////////////
 //
 // TouchTabStrip
 //
 //  A View that overrides Touch specific behavior.
 //
 ///////////////////////////////////////////////////////////////////////////////
 class TouchTabStrip : public TabStrip {
@@ skipping 11 matching lines @@
   // BaseTabStrip overrides:
   virtual BaseTab* CreateTab() OVERRIDE;
 
  private:
   virtual ui::TouchStatus OnTouchEvent(const views::TouchEvent& event) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(TouchTabStrip);
 };
 
 #endif  // CHROME_BROWSER_UI_TOUCH_TABS_TOUCH_TAB_STRIP_H_