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

chrome/browser/chromeos/login/user_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/user_view.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/chromeos/login/helper.h"
 #include "chrome/browser/chromeos/login/rounded_rect_painter.h"
 #include "chrome/browser/chromeos/login/rounded_view.h"
@@ skipping 183 matching lines @@
   }
 
  private:
   // Update button position and schedule paint event for the view and parent.
   void UpdatePosition() {
     gfx::Size size = GetPreferredSize();
     gfx::Point origin = top_right_;
     origin.Offset(-size.width(), 0);
     SetBoundsRect(gfx::Rect(origin, size));
 
-    if (GetParent())
-      GetParent()->SchedulePaint();
+    if (parent())
+      parent()->SchedulePaint();
   }
 
   SkBitmap icon_;
   std::wstring text_;
   gfx::Point top_right_;
   bool was_first_click_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoveButton);
 };
 
@@ skipping 122 matching lines @@
     delegate_->OnRemoveUser();
 }
 
 void UserView::OnLocaleChanged() {
   remove_button_->SetText(
       UTF16ToWide(l10n_util::GetStringUTF16(IDS_LOGIN_REMOVE)));
   delegate_->OnLocaleChanged();
 }
 
 }  // namespace chromeos