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

ash/system/tray/system_tray.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/system/tray/system_tray.h"
 
 #include "ash/ash_switches.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
@@ skipping 648 matching lines @@
     system_bubble_->bubble()->RestartAutoCloseTimer();
 }
 
 base::string16 SystemTray::GetAccessibleNameForBubble() {
   return GetAccessibleNameForTray();
 }
 
 gfx::Rect SystemTray::GetAnchorRect(
     views::Widget* anchor_widget,
     TrayBubbleView::AnchorType anchor_type,
-    TrayBubbleView::AnchorAlignment anchor_alignment) {
+    TrayBubbleView::AnchorAlignment anchor_alignment) const {
   return GetBubbleAnchorRect(anchor_widget, anchor_type, anchor_alignment);
 }
 
 void SystemTray::HideBubble(const TrayBubbleView* bubble_view) {
   HideBubbleWithView(bubble_view);
 }
 
 views::View* SystemTray::GetTrayItemViewForTest(SystemTrayItem* item) {
   std::map<SystemTrayItem*, views::View*>::iterator it =
       tray_item_map_.find(item);
@@ skipping 28 matching lines @@
   system_bubble_.reset();
   // When closing a system bubble with the alternate shelf layout, we need to
   // turn off the active tinting of the shelf.
   if (full_system_tray_menu_) {
     SetDrawBackgroundAsActive(false);
     full_system_tray_menu_ = false;
   }
 }
 
 }  // namespace ash