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

ash/system/chromeos/power/power_status_view.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/power/power_status_view.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/chromeos/power/power_status.h"
 #include "ash/system/chromeos/power/tray_power.h"
@@ skipping 179 matching lines @@
     }
   } else {
     time_label_->SetText(base::string16());
   }
 }
 
 void PowerStatusView::ChildPreferredSizeChanged(views::View* child) {
   PreferredSizeChanged();
 }
 
-gfx::Size PowerStatusView::GetPreferredSize() {
+gfx::Size PowerStatusView::GetPreferredSize() const {
   gfx::Size size = views::View::GetPreferredSize();
   return gfx::Size(size.width(), kTrayPopupItemHeight);
 }
 
-int PowerStatusView::GetHeightForWidth(int width) {
+int PowerStatusView::GetHeightForWidth(int width) const {
   return kTrayPopupItemHeight;
 }
 
 void PowerStatusView::Layout() {
   views::View::Layout();
 
   // Move the time_status_label_ closer to percentage_label_.
   if (percentage_label_ && time_status_label_ &&
       percentage_label_->visible() && time_status_label_->visible()) {
     time_status_label_->SetX(percentage_label_->bounds().right() + 1);
   }
 }
 
 }  // namespace ash