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

ash/wm/workspace/workspace_manager.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/wm/workspace/workspace_manager.h"
 
 #include <algorithm>
 #include <functional>
 
 #include "ash/root_window_controller.h"
@@ skipping 98 matching lines @@
 // WorkspaceManager -----------------------------------------------------------
 
 WorkspaceManager::WorkspaceManager(Window* contents_window)
     : contents_window_(contents_window),
       active_workspace_(NULL),
       shelf_(NULL),
       in_move_(false),
       clear_unminimizing_workspace_factory_(this),
       unminimizing_workspace_(NULL),
       app_terminating_(false),
-      creating_fade_(false),
-      workspace_cycler_(NULL) {
+      creating_fade_(false) {
   // Clobber any existing event filter.
   contents_window->SetEventFilter(NULL);
   // |contents_window| takes ownership of LayoutManagerImpl.
   contents_window->SetLayoutManager(new LayoutManagerImpl(this));
   active_workspace_ = CreateWorkspace(false);
   workspaces_.push_back(active_workspace_);
   active_workspace_->window()->Show();
   Shell::GetInstance()->AddShellObserver(this);
 
   if (ash::WorkspaceCyclerConfiguration::IsCyclerEnabled())
@@ skipping 703 matching lines @@
     new_workspace->window()->Show();
   ReparentWindow(window, new_workspace->window(), NULL);
   if (is_active) {
     SetActiveWorkspace(new_workspace, SWITCH_TRACKED_BY_WORKSPACE_CHANGED,
                        base::TimeDelta());
   }
 }
 
 }  // namespace internal
 }  // namespace ash