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

chrome/browser/ui/views/validation_message_bubble_delegate.cc

 // 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.
 
 #include "chrome/browser/ui/views/validation_message_bubble_delegate.h"
 
 #include "grit/theme_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
@@ skipping 71 matching lines @@
 void ValidationMessageBubbleDelegate::Close() {
   GetWidget()->Close();
   observer_ = NULL;
 }
 
 void ValidationMessageBubbleDelegate::SetPositionRelativeToAnchor(
     const gfx::Rect& anchor_in_screen) {
   SetAnchorRect(anchor_in_screen);
 }
 
-gfx::Size ValidationMessageBubbleDelegate::GetPreferredSize() {
+gfx::Size ValidationMessageBubbleDelegate::GetPreferredSize() const {
   return gfx::Size(width_, height_);
 }
 
 void ValidationMessageBubbleDelegate::DeleteDelegate() {
   delete this;
 }
 
 void ValidationMessageBubbleDelegate::WindowClosing() {
   if (observer_ != NULL)
     observer_->WindowClosing();
 }