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

ui/app_list/views/start_page_view.cc

 // Copyright 2014 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/app_list/views/start_page_view.h"
 
 #include "content/public/browser/web_contents.h"
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/views/app_list_main_view.h"
 #include "ui/gfx/canvas.h"
@@ skipping 16 matching lines @@
 
 // A button that is the placeholder for the search bar in the start page view.
 class BarPlaceholderButton : public views::CustomButton {
  public:
   explicit BarPlaceholderButton(views::ButtonListener* listener)
       : views::CustomButton(listener) {}
 
   virtual ~BarPlaceholderButton() {}
 
   // Overridden from views::View:
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(kBarPlaceholderWidth, kBarPlaceholderHeight);
   }
 
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     PaintButton(
         canvas,
         state() == STATE_HOVERED ? kPagerHoverColor : kPagerNormalColor);
   }
 
  private:
@@ skipping 40 matching lines @@
   instant_container_->SetVisible(true);
 }
 
 void StartPageView::ButtonPressed(views::Button* sender,
                                   const ui::Event& event) {
   app_list_main_view_->OnStartPageSearchButtonPressed();
   instant_container_->SetVisible(false);
 }
 
 }  // namespace app_list