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

ash/system/chromeos/power/power_status_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 ASH_SYSTEM_CHROMEOS_POWER_POWER_STATUS_VIEW_H_
 #define ASH_SYSTEM_CHROMEOS_POWER_POWER_STATUS_VIEW_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/chromeos/power/power_status.h"
 #include "ui/views/view.h"
@@ skipping 10 matching lines @@
  public:
   enum ViewType {
     VIEW_DEFAULT,
     VIEW_NOTIFICATION
   };
 
   PowerStatusView(ViewType view_type, bool default_view_right_align);
   virtual ~PowerStatusView();
 
   // Overridden from views::View.
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
-  virtual int GetHeightForWidth(int width) OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
+  virtual int GetHeightForWidth(int width) const OVERRIDE;
   virtual void Layout() OVERRIDE;
 
   // Overridden from PowerStatus::Observer.
   virtual void OnPowerStatusChanged() OVERRIDE;
 
  private:
   friend class PowerStatusDefaultViewTest;
   friend class PowerStatusNotificationViewTest;
 
   void LayoutDefaultView();
@@ skipping 20 matching lines @@
   views::ImageView* icon_;
 
   ViewType view_type_;
 
   DISALLOW_COPY_AND_ASSIGN(PowerStatusView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_POWER_POWER_STATUS_VIEW_H_