Rewrite scoped_ptr<T>(NULL) to use the default ctor in ui/.

ui/oak/oak_window.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 "ui/oak/oak_window.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 11 matching lines @@
 namespace {
 const SkColor kBorderColor = SkColorSetRGB(0xCC, 0xCC, 0xCC);
 }  // namespace
 
 // static
 views::Widget* OakWindow::instance = NULL;
 
 ////////////////////////////////////////////////////////////////////////////////
 // OakWindow, public:
 
-OakWindow::OakWindow() : tree_(NULL), tree_container_(NULL), details_(NULL) {
-}
+OakWindow::OakWindow() : tree_container_(NULL) {}
 
 OakWindow::~OakWindow() {
   // The tree/table need to be destroyed before the model.
   tree_.reset();
   details_.reset();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // OakWindow, views::WidgetDelegateView implementation:
 
@@ skipping 106 matching lines @@
     // context? For now, this is OK, but if we ever use Oak outside of the ash
     // shell, we run into crbug.com/165759.
     internal::OakWindow::instance =
         views::Widget::CreateWindowWithContextAndBounds(
             new internal::OakWindow, context, gfx::Rect(10, 10, 500, 500));
   }
   internal::OakWindow::instance->Show();
 }
 
 }  // namespace oak