views: Also const-ify GetMaximumSize().

ui/views/bubble/tray_bubble_view.h

 // 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.
 
 #ifndef UI_VIEWS_BUBBLE_TRAY_BUBBLE_VIEW_H_
 #define UI_VIEWS_BUBBLE_TRAY_BUBBLE_VIEW_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/bubble/bubble_delegate.h"
 #include "ui/views/mouse_watcher.h"
@@ skipping 140 matching lines @@
   virtual views::NonClientFrameView* CreateNonClientFrameView(
       views::Widget* widget) OVERRIDE;
   virtual bool WidgetHasHitTestMask() const OVERRIDE;
   virtual void GetWidgetHitTestMask(gfx::Path* mask) const OVERRIDE;
 
   // Overridden from views::BubbleDelegateView.
   virtual gfx::Rect GetAnchorRect() const OVERRIDE;
 
   // Overridden from views::View.
   virtual gfx::Size GetPreferredSize() const OVERRIDE;
-  virtual gfx::Size GetMaximumSize() OVERRIDE;
+  virtual gfx::Size GetMaximumSize() const OVERRIDE;
   virtual int GetHeightForWidth(int width) const OVERRIDE;
   virtual void OnMouseEntered(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const ui::MouseEvent& event) OVERRIDE;
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
 
   // Overridden from MouseWatcherListener
   virtual void MouseMovedOutOfHost() OVERRIDE;
 
  protected:
   TrayBubbleView(gfx::NativeView parent_window,
@@ skipping 23 matching lines @@
 
   // Used to find any mouse movements.
   scoped_ptr<MouseWatcher> mouse_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBubbleView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BUBBLE_TRAY_BUBBLE_VIEW_H_