views: Make view::Views::GetPreferredSize() const.

ui/views/controls/menu/menu_scroll_view_container.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_CONTROLS_MENU_MENU_SCROLL_VIEW_CONTAINER_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_SCROLL_VIEW_CONTAINER_H_
 
 #include "ui/views/view.h"
 #include "ui/views/bubble/bubble_border.h"
 #include "ui/views/controls/menu/menu_types.h"
@@ skipping 15 matching lines @@
 
   // External function to check if the bubble border is usd.
   bool HasBubbleBorder();
 
   // Offsets the Arrow from the default location.
   void SetBubbleArrowOffset(int offset);
 
   // View overrides.
   virtual void OnPaintBackground(gfx::Canvas* canvas) OVERRIDE;
   virtual void Layout() OVERRIDE;
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
 
  protected:
   // View override.
   virtual void OnBoundsChanged(const gfx::Rect& previous_bounds) OVERRIDE;
 
  private:
   // Create the default border.
   void CreateDefaultBorder();
 
@@ skipping 19 matching lines @@
 
   // Weak reference to the currently set border.
   BubbleBorder* bubble_border_;
 
   DISALLOW_COPY_AND_ASSIGN(MenuScrollViewContainer);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_SCROLL_VIEW_CONTAINER_H_