Get rid of the EnableClose() infrastructure in Widget.

chrome/browser/ui/panels/panel_browser_frame_view.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_PANELS_PANEL_BROWSER_FRAME_VIEW_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_FRAME_VIEW_H_
 #pragma once
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 48 matching lines @@
   virtual int GetHorizontalTabStripVerticalOffset(bool restored) const OVERRIDE;
   virtual void UpdateThrobber(bool running) OVERRIDE;
 
   // Overridden from views::NonClientFrameView:
   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;
 
   // Overridden from views::View:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void OnThemeChanged() OVERRIDE;
   virtual gfx::Size GetMinimumSize() OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual bool OnMousePressed(const views::MouseEvent& event) OVERRIDE;
@@ skipping 113 matching lines @@
   // Used to animate the visibility change of settings button.
   scoped_ptr<ui::SlideAnimation> settings_button_animator_;
   gfx::Rect settings_button_full_bounds_;
   gfx::Rect settings_button_zero_bounds_;
   bool is_settings_button_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(PanelBrowserFrameView);
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_BROWSER_FRAME_VIEW_H_