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

ui/message_center/views/message_center_view.h

 // Copyright (c) 2013 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_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_
 
 
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/message_center/message_center_export.h"
@@ skipping 50 matching lines @@
   void SetSettingsVisible(bool visible);
   void OnSettingsChanged();
   bool settings_visible() const { return settings_visible_; }
   MessageCenterTray* tray() { return tray_; }
 
   void SetIsClosing(bool is_closing);
 
  protected:
   // Overridden from views::View:
   virtual void Layout() OVERRIDE;
-  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 bool OnMouseWheel(const ui::MouseWheelEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
 
   // Overridden from MessageCenterObserver:
   virtual void OnNotificationAdded(const std::string& id) OVERRIDE;
   virtual void OnNotificationRemoved(const std::string& id,
                                      bool by_user) OVERRIDE;
   virtual void OnNotificationUpdated(const std::string& id) OVERRIDE;
 
   // Overridden from MessageCenterController:
@@ skipping 54 matching lines @@
   bool is_closing_;
 
   scoped_ptr<MessageViewContextMenuController> context_menu_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MessageCenterView);
 };
 
 }  // namespace message_center
 
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_CENTER_VIEW_H_