Get rid of the EnableClose() infrastructure in Widget.

ui/views/bubble/bubble_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 UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_
 #define UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_
 #pragma once
 
 #include "base/gtest_prod_util.h"
 #include "ui/views/bubble/bubble_border.h"
@@ skipping 14 matching lines @@
                   bool allow_bubble_offscreen);
   virtual ~BubbleFrameView();
 
   // 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 {}
 
   // View overrides:
   virtual gfx::Size GetPreferredSize() OVERRIDE;
 
   // Accessor for bubble border inside border contents.
   BubbleBorder* bubble_border() const;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(BubbleFrameViewBasicTest, GetBoundsForClientView);
 
   BorderContentsView* border_contents_;
   BubbleBorder::ArrowLocation location_;
   bool allow_bubble_offscreen_;
 
   DISALLOW_COPY_AND_ASSIGN(BubbleFrameView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_BUBBLE_FRAME_VIEW_H_