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

ash/system/tray/system_tray.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 ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 
 #include "ash/ash_export.h"
 #include "ash/system/tray/system_tray_bubble.h"
 #include "ash/system/tray/tray_background_view.h"
@@ skipping 117 matching lines @@
   virtual void BubbleResized(const views::TrayBubbleView* bubble_view) OVERRIDE;
   virtual void HideBubbleWithView(
       const views::TrayBubbleView* bubble_view) OVERRIDE;
   virtual bool ClickedOutsideBubble() OVERRIDE;
 
   // Overridden from message_center::TrayBubbleView::Delegate.
   virtual void BubbleViewDestroyed() OVERRIDE;
   virtual void OnMouseEnteredView() OVERRIDE;
   virtual void OnMouseExitedView() OVERRIDE;
   virtual base::string16 GetAccessibleNameForBubble() OVERRIDE;
-  virtual gfx::Rect GetAnchorRect(views::Widget* anchor_widget,
-                                  AnchorType anchor_type,
-                                  AnchorAlignment anchor_alignment) OVERRIDE;
+  virtual gfx::Rect GetAnchorRect(
+      views::Widget* anchor_widget,
+      AnchorType anchor_type,
+      AnchorAlignment anchor_alignment) const OVERRIDE;
   virtual void HideBubble(const views::TrayBubbleView* bubble_view) OVERRIDE;
 
   TrayAccessibility* GetTrayAccessibilityForTest() {
     return tray_accessibility_;
   }
 
   // Get the tray item view (or NULL) for a given |tray_item| in a unit test.
   views::View* GetTrayItemViewForTest(SystemTrayItem* tray_item);
 
   // Gets tray_date_ for browser tests.
@@ skipping 75 matching lines @@
 
   TrayAccessibility* tray_accessibility_;  // not owned
   TrayDate* tray_date_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_