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

ui/views/controls/combobox/native_combobox_views_unittest.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 "base/strings/utf_string_conversions.h"
 #include "ui/base/events/event.h"
 #include "ui/base/keycodes/keyboard_codes.h"
 #include "ui/base/models/combobox_model.h"
 #include "ui/views/controls/combobox/combobox.h"
 #include "ui/views/controls/combobox/native_combobox_views.h"
@@ skipping 61 matching lines @@
 }  // namespace
 
 namespace views {
 
 class NativeComboboxViewsTest : public ViewsTestBase {
  public:
   NativeComboboxViewsTest()
       : widget_(NULL),
         combobox_(NULL),
         combobox_view_(NULL),
-        model_(NULL),
-        input_method_(NULL) {
-  }
+        input_method_(NULL) {}
 
   // ::testing::Test:
   virtual void SetUp() {
     ViewsTestBase::SetUp();
   }
 
   virtual void TearDown() {
     if (widget_)
       widget_->Close();
     ViewsTestBase::TearDown();
@@ skipping 92 matching lines @@
   widget_->SetContentsView(container);
   container->AddChildView(combobox_);
 
   combobox_view_ = static_cast<NativeComboboxViews*>(
       combobox_->GetNativeWrapperForTesting());
   ASSERT_TRUE(combobox_view_);
   ASSERT_FALSE(combobox_view_->enabled());
 }
 
 }  // namespace views