views: Also const-ify GetMaximumSize().

ash/frame/custom_frame_view_ash_unittest.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 "ash/frame/custom_frame_view_ash.h"
 
 #include "ash/frame/caption_buttons/frame_caption_button.h"
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
@@ skipping 34 matching lines @@
 class TestWidgetConstraintsDelegate : public TestWidgetDelegate {
  public:
   TestWidgetConstraintsDelegate() {}
   virtual ~TestWidgetConstraintsDelegate() {}
 
   // views::View:
   virtual gfx::Size GetMinimumSize() const OVERRIDE {
     return minimum_size_;
   }
 
-  virtual gfx::Size GetMaximumSize() OVERRIDE {
+  virtual gfx::Size GetMaximumSize() const OVERRIDE {
     return maximum_size_;
   }
 
   virtual views::View* GetContentsView() OVERRIDE {
     // Set this instance as the contents view so that the maximum and minimum
     // size constraints will be used.
     return this;
   }
 
   // views::WidgetDelegate:
@@ skipping 147 matching lines @@
   const gfx::Rect maximize_mode_bounds = delegate->
       GetFrameCaptionButtonContainerViewBounds();
   EXPECT_GT(initial.width(), maximize_mode_bounds.width());
   Shell::GetInstance()->EnableMaximizeModeWindowManager(false);
   const gfx::Rect after_restore = delegate->
       GetFrameCaptionButtonContainerViewBounds();
   EXPECT_EQ(initial, after_restore);
 }
 
 }  // namespace ash