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

ui/views/controls/scrollbar/scrollbar_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 "ui/views/controls/scrollbar/native_scroll_bar.h"
 #include "ui/views/controls/scrollbar/native_scroll_bar_views.h"
 #include "ui/views/controls/scrollbar/scroll_bar.h"
 #include "ui/views/test/views_test_base.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 30 matching lines @@
   bool last_is_page;
   int last_position;
 };
 
 }  // namespace
 
 namespace views {
 
 class NativeScrollBarTest : public ViewsTestBase {
  public:
-  NativeScrollBarTest()
-    : widget_(NULL),
-      scrollbar_(NULL),
-      controller_(NULL) {
-  }
+  NativeScrollBarTest() : widget_(NULL), scrollbar_(NULL) {}
 
   virtual void SetUp() {
     ViewsTestBase::SetUp();
     controller_.reset(new TestScrollBarController());
 
     ASSERT_FALSE(scrollbar_);
     native_scrollbar_ = new NativeScrollBar(true);
     native_scrollbar_->SetBounds(0, 0, 100, 100);
     native_scrollbar_->set_controller(controller_.get());
 
@@ skipping 88 matching lines @@
   EXPECT_EQ(99, scrollbar_->GetMaxPosition());
   EXPECT_EQ(0, scrollbar_->GetMinPosition());
 
   scrollbar_->Update(100, 199, 99);
   EXPECT_EQ(
       scrollbar_->GetTrackBounds().width() - scrollbar_->GetThumbSizeForTest(),
       scrollbar_->GetPosition());
 }
 
 }  // namespace views