Rework tree APIs to reflect Google style and more const-correctness....

chrome/browser/chromeos/login/background_view.cc

 // Copyright (c) 2011 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 "chrome/browser/chromeos/login/background_view.h"
 
 #include <string>
 #include <vector>
 
 #include "base/string16.h"
@@ skipping 178 matching lines @@
 
 void BackgroundView::CreateModalPopup(views::WindowDelegate* view) {
   views::Window* window = browser::CreateViewsWindow(
       GetNativeWindow(), gfx::Rect(), view);
   window->SetIsAlwaysOnTop(true);
   window->Show();
 }
 
 gfx::NativeWindow BackgroundView::GetNativeWindow() const {
   return
-      GTK_WINDOW(static_cast<WidgetGtk*>(GetWidget())->GetNativeView());
+      GTK_WINDOW(static_cast<const WidgetGtk*>(GetWidget())->GetNativeView());
 }
 
 void BackgroundView::SetStatusAreaVisible(bool visible) {
   status_area_->SetVisible(visible);
 }
 
 void BackgroundView::SetStatusAreaEnabled(bool enable) {
   status_area_->MakeButtonsActive(enable);
 }
 
@@ skipping 234 matching lines @@
             kBootTimesNoChromeExec,
             boot_times.total,
             boot_times.pre_startup,
             boot_times.system);
   }
   // Use UTF8ToWide once this string is localized.
   boot_times_label_->SetText(ASCIIToWide(boot_times_text));
 }
 
 }  // namespace chromeos