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

chrome/browser/ui/views/validation_message_bubble_delegate.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 CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_DELEGATE_H_
 #define CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_DELEGATE_H_
 
 #include "ui/views/bubble/bubble_delegate.h"
 
 // A BubbleDelegateView implementation for form validation message bubble.
@@ skipping 15 matching lines @@
   ValidationMessageBubbleDelegate(const gfx::Rect& anchor_in_screen,
                                   const base::string16& main_text,
                                   const base::string16& sub_text,
                                   Observer* observer);
   virtual ~ValidationMessageBubbleDelegate();
 
   void Close();
   void SetPositionRelativeToAnchor(const gfx::Rect& anchor_in_screen);
 
   // BubbleDelegateView overrides:
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual void DeleteDelegate() OVERRIDE;
   virtual void WindowClosing() OVERRIDE;
 
  private:
   Observer* observer_;
   int width_;
   int height_;
 
   DISALLOW_COPY_AND_ASSIGN(ValidationMessageBubbleDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_VALIDATION_MESSAGE_BUBBLE_DELEGATE_H_