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

ash/system/chromeos/network/tray_sms.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/chromeos/network/tray_sms.h"
 
 #include "ash/shell.h"
 #include "ash/system/tray/fixed_sized_scroll_view.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_bubble.h"
@@ skipping 182 matching lines @@
     CreateSpecialRow(IDS_ASH_STATUS_TRAY_SMS, this);
   }
 
   void Update() {
     UpdateMessageList();
     Layout();
     SchedulePaint();
   }
 
   // Overridden from views::View.
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     gfx::Size preferred_size = TrayDetailsView::GetPreferredSize();
     if (preferred_size.height() < kMessageListMinHeight)
       preferred_size.set_height(kMessageListMinHeight);
     return preferred_size;
   }
 
  private:
   void UpdateMessageList() {
     const base::ListValue& messages =
         static_cast<TraySms*>(owner())->messages();
@@ skipping 196 matching lines @@
       std::string number, text;
       if (GetLatestMessage(&index, &number, &text))
         notification_->Update(index, number, text);
     } else if (notify) {
       ShowNotificationView();
     }
   }
 }
 
 }  // namespace ash