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

ui/message_center/views/notification_button.cc

 // Copyright 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 "ui/message_center/views/notification_button.h"
 
 #include "ui/gfx/canvas.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/views/constants.h"
 #include "ui/views/background.h"
@@ skipping 53 matching lines @@
     title_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
     title_->SetEnabledColor(message_center::kRegularTextColor);
     title_->SetBackgroundColor(kRegularTextBackgroundColor);
     title_->SetBorder(
         views::Border::CreateEmptyBorder(kButtonTitleTopPadding, 0, 0, 0));
     AddChildView(title_);
   }
   SetAccessibleName(title);
 }
 
-gfx::Size NotificationButton::GetPreferredSize() {
+gfx::Size NotificationButton::GetPreferredSize() const {
   return gfx::Size(message_center::kNotificationWidth,
                    message_center::kButtonHeight);
 }
 
-int NotificationButton::GetHeightForWidth(int width) {
+int NotificationButton::GetHeightForWidth(int width) const {
   return message_center::kButtonHeight;
 }
 
 void NotificationButton::OnPaint(gfx::Canvas* canvas) {
   CustomButton::OnPaint(canvas);
   views::Painter::PaintFocusPainter(this, canvas, focus_painter_.get());
 }
 
 void NotificationButton::OnFocus() {
   views::CustomButton::OnFocus();
@@ skipping 11 matching lines @@
 void NotificationButton::StateChanged() {
   if (state() == STATE_HOVERED || state() == STATE_PRESSED) {
     set_background(views::Background::CreateSolidBackground(
         message_center::kHoveredButtonBackgroundColor));
   } else {
     set_background(NULL);
   }
 }
 
 }  // namespace message_center