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

chrome/browser/ui/views/tab_icon_view.h

 // Copyright (c) 2012 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_TAB_ICON_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/controls/button/menu_button.h"
@@ skipping 17 matching lines @@
   virtual ~TabIconView();
 
   // Invoke whenever the tab state changes or the throbber should update.
   void Update();
 
   // Set the throbber to the light style (for use on dark backgrounds).
   void set_is_light(bool is_light) { is_light_ = is_light; }
 
   // Overridden from View
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
 
  private:
   void PaintThrobber(gfx::Canvas* canvas);
   void PaintFavicon(gfx::Canvas* canvas, const gfx::ImageSkia& image);
   void PaintIcon(gfx::Canvas* canvas,
                  const gfx::ImageSkia& image,
                  int src_x,
                  int src_y,
                  int src_w,
                  int src_h,
                  bool filter);
 
   // Our model.
   chrome::TabIconViewModel* model_;
 
   // Whether the throbber is running.
   bool throbber_running_;
 
   // Whether we should display our light or dark style.
   bool is_light_;
 
   // Current frame of the throbber being painted. This is only used if
   // throbber_running_ is true.
   int throbber_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(TabIconView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_H_