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

chrome/browser/chromeos/login/shutdown_button.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/shutdown_button.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/chromeos/cros/cros_library.h"
 #include "chrome/browser/chromeos/cros/power_library.h"
 #include "chrome/browser/chromeos/login/rounded_rect_painter.h"
@@ skipping 91 matching lines @@
   gfx::Size button_size = GetPreferredSize();
   SetBounds(
       parent->width() - button_size.width()- kRightPadding,
       parent->height() - button_size.height() - kBottomPadding,
       button_size.width(),
       button_size.height());
 }
 
 void ShutdownButton::OnLocaleChanged() {
   SetText(UTF8ToWide(l10n_util::GetStringUTF8(IDS_SHUTDOWN_BUTTON)));
-  if (GetParent()) {
-    GetParent()->Layout();
-    GetParent()->SchedulePaint();
+  if (parent()) {
+    parent()->Layout();
+    parent()->SchedulePaint();
   }
 }
 
 gfx::NativeCursor ShutdownButton::GetCursorForPoint(
     views::Event::EventType event_type,
     const gfx::Point& p) {
   if (!IsEnabled()) {
     return NULL;
   }
   return gfx::GetCursor(GDK_HAND2);
 }
 
 void ShutdownButton::ButtonPressed(views::Button* sender,
                                    const views::Event& event) {
   DCHECK(CrosLibrary::Get()->EnsureLoaded());
   CrosLibrary::Get()->GetPowerLibrary()->RequestShutdown();
 }
 
 }  // namespace chromeos