Remove unused code for the metro window switcher button

chrome/browser/ui/views/frame/opaque_browser_frame_view_layout_delegate.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 CHROME_BROWSER_UI_VIEWS_FRAME_OPAQUE_BROWSER_FRAME_VIEW_LAYOUT_DELEGATE_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_OPAQUE_BROWSER_FRAME_VIEW_LAYOUT_DELEGATE_H_
 
 namespace gfx {
 class Size;
 }
@@ skipping 36 matching lines @@
   virtual gfx::ImageSkia GetOTRAvatarIcon() const = 0;
 
   // Controls window state.
   virtual bool IsMaximized() const = 0;
   virtual bool IsMinimized() const = 0;
   virtual bool IsFullscreen() const = 0;
 
   virtual bool IsTabStripVisible() const = 0;
   virtual int GetTabStripHeight() const = 0;
 
-  // Various platforms need to be able to add more space to the
-  // tabstrip. Windows 8 metro mode uses this to account for the window
-  // switcher button.
-  virtual int GetAdditionalReservedSpaceInTabStrip() const = 0;
-
   // Returns the tabstrips preferred size so the frame layout can work around
   // it.
   virtual gfx::Size GetTabstripPreferredSize() const = 0;
 
  protected:
   virtual ~OpaqueBrowserFrameViewLayoutDelegate() {}
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_OPAQUE_BROWSER_FRAME_VIEW_LAYOUT_DELEGATE_H_