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

ui/views/controls/button/menu_button.cc

 // Copyright (c) 2012 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/views/controls/button/menu_button.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "grit/ui_strings.h"
 #include "ui/accessibility/ax_view_state.h"
@@ skipping 128 matching lines @@
   if (show_menu_marker_)
     PaintMenuMarker(canvas);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 //
 // MenuButton - Events
 //
 ////////////////////////////////////////////////////////////////////////////////
 
-gfx::Size MenuButton::GetPreferredSize() {
+gfx::Size MenuButton::GetPreferredSize() const {
   gfx::Size prefsize = TextButton::GetPreferredSize();
   if (show_menu_marker_) {
     prefsize.Enlarge(menu_marker_->width() + kMenuMarkerPaddingLeft +
                          kMenuMarkerPaddingRight,
                      0);
   }
   return prefsize;
 }
 
 const char* MenuButton::GetClassName() const {
@@ skipping 109 matching lines @@
   if (!GetWidget()) {
     NOTREACHED();
     return 0;
   }
 
   gfx::Rect monitor_bounds = GetWidget()->GetWorkAreaBoundsInScreen();
   return monitor_bounds.right() - 1;
 }
 
 }  // namespace views