views: Also const-ify GetMaximumSize().

apps/ui/views/native_app_window_views.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 "apps/ui/views/native_app_window_views.h"
 
 #include "apps/app_window.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
@@ skipping 277 matching lines @@
     web_view_ = new views::WebView(NULL);
     AddChildView(web_view_);
     web_view_->SetWebContents(app_window_->web_contents());
   }
 }
 
 gfx::Size NativeAppWindowViews::GetMinimumSize() const {
   return size_constraints_.GetMinimumSize();
 }
 
-gfx::Size NativeAppWindowViews::GetMaximumSize() {
+gfx::Size NativeAppWindowViews::GetMaximumSize() const {
   return size_constraints_.GetMaximumSize();
 }
 
 void NativeAppWindowViews::OnFocus() {
   web_view_->RequestFocus();
 }
 
 // NativeAppWindow implementation.
 
 void NativeAppWindowViews::SetFullscreen(int fullscreen_types) {
@@ skipping 84 matching lines @@
   return size_constraints_.GetMaximumSize();
 }
 
 void NativeAppWindowViews::SetContentSizeConstraints(
     const gfx::Size& min_size, const gfx::Size& max_size) {
   size_constraints_.set_minimum_size(min_size);
   size_constraints_.set_maximum_size(max_size);
 }
 
 }  // namespace apps