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

ash/shelf/shelf_widget.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 "ash/shelf/shelf_widget.h"
 
 #include "ash/focus_cycler.h"
 #include "ash/launcher/launcher_delegate.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/launcher_navigator.h"
@@ skipping 409 matching lines @@
   if (GetDimmed())
     return dimmer_view_->GetBoundsInScreen();
   return gfx::Rect();
 }
 
 void ShelfWidget::DelegateView::UpdateBackground(int alpha) {
   alpha_ = alpha;
   SchedulePaint();
 }
 
-ShelfWidget::ShelfWidget(
-    aura::Window* shelf_container,
-    aura::Window* status_container,
-    internal::WorkspaceController* workspace_controller) :
-    launcher_(NULL),
-    delegate_view_(new DelegateView(this)),
-    background_animator_(delegate_view_, 0, kLauncherBackgroundAlpha),
-    activating_as_fallback_(false),
-    window_container_(shelf_container) {
+ShelfWidget::ShelfWidget(aura::Window* shelf_container,
+                         aura::Window* status_container,
+                         internal::WorkspaceController* workspace_controller)
+    : delegate_view_(new DelegateView(this)),
+      background_animator_(delegate_view_, 0, kLauncherBackgroundAlpha),
+      activating_as_fallback_(false),
+      window_container_(shelf_container) {
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.transparent = true;
   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
   params.parent = shelf_container;
   params.delegate = delegate_view_;
   Init(params);
 
   // The shelf should not take focus when initially shown.
   set_focus_on_creation(false);
@@ skipping 127 matching lines @@
     return delegate_view_->GetDimmerBoundsForTest();
   return gfx::Rect();
 }
 
 void ShelfWidget::DisableDimmingAnimationsForTest() {
   DCHECK(delegate_view_);
   return delegate_view_->disable_dimming_animations_for_test();
 }
 
 }  // namespace ash