Get rid of the EnableClose() infrastructure in Widget.

chrome/browser/ui/views/frame/browser_non_client_frame_view_aura.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_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_AURA_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_AURA_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/ui/views/frame/browser_non_client_frame_view.h"
@@ skipping 38 matching lines @@
   virtual int GetHorizontalTabStripVerticalOffset(bool restored) const OVERRIDE;
   virtual void UpdateThrobber(bool running) OVERRIDE;
 
   // views::NonClientFrameView overrides:
   virtual gfx::Rect GetBoundsForClientView() const OVERRIDE;
   virtual gfx::Rect GetWindowBoundsForClientBounds(
       const gfx::Rect& client_bounds) const OVERRIDE;
   virtual int NonClientHitTest(const gfx::Point& point) OVERRIDE;
   virtual void GetWindowMask(const gfx::Size& size,
                              gfx::Path* window_mask) OVERRIDE;
-  virtual void EnableClose(bool enable) OVERRIDE;
   virtual void ResetWindowControls() OVERRIDE;
   virtual void UpdateWindowIcon() OVERRIDE;
   virtual void ShouldPaintAsActiveChanged() OVERRIDE;
 
   // views::View overrides:
   virtual void Layout() OVERRIDE;
   virtual views::View* GetEventHandlerForPoint(
       const gfx::Point& point) OVERRIDE;
   virtual bool HitTest(const gfx::Point& p) const OVERRIDE;
   virtual void OnMouseMoved(const views::MouseEvent& event) OVERRIDE;
@@ skipping 13 matching lines @@
 
   int last_hittest_code_;
   WindowControlButton* maximize_button_;
   WindowControlButton* close_button_;
   FrameBackground* frame_background_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserNonClientFrameViewAura);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_NON_CLIENT_FRAME_VIEW_AURA_H_