views: Also const-ify GetMaximumSize().

ash/frame/custom_frame_view_ash.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 "ash/frame/custom_frame_view_ash.h"
 
 #include "ash/ash_switches.h"
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/frame/default_header_painter.h"
 #include "ash/frame/frame_border_hit_test_controller.h"
@@ skipping 467 matching lines @@
   return kViewClassName;
 }
 
 gfx::Size CustomFrameViewAsh::GetMinimumSize() const {
   gfx::Size min_client_view_size(frame_->client_view()->GetMinimumSize());
   return gfx::Size(
       std::max(header_view_->GetMinimumWidth(), min_client_view_size.width()),
       NonClientTopBorderHeight() + min_client_view_size.height());
 }
 
-gfx::Size CustomFrameViewAsh::GetMaximumSize() {
+gfx::Size CustomFrameViewAsh::GetMaximumSize() const {
   gfx::Size max_client_size(frame_->client_view()->GetMaximumSize());
   int width = 0;
   int height = 0;
 
   if (max_client_size.width() > 0)
     width = std::max(header_view_->GetMinimumWidth(), max_client_size.width());
   if (max_client_size.height() > 0)
     height = NonClientTopBorderHeight() + max_client_size.height();
 
   return gfx::Size(width, height);
@@ skipping 38 matching lines @@
 FrameCaptionButtonContainerView* CustomFrameViewAsh::
     GetFrameCaptionButtonContainerViewForTest() {
   return header_view_->caption_button_container();
 }
 
 int CustomFrameViewAsh::NonClientTopBorderHeight() const {
   return frame_->IsFullscreen() ? 0 : header_view_->GetPreferredHeight();
 }
 
 }  // namespace ash