Refactors DockedWindowLayoutManager in terms of ash/wm/common

ash/system/status_area_widget_delegate.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/system/status_area_widget_delegate.h"
 
 #include "ash/ash_export.h"
 #include "ash/ash_switches.h"
 #include "ash/focus_cycler.h"
 #include "ash/shelf/shelf_util.h"
@@ skipping 31 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegateAnimationSettings);
 };
 
 }  // namespace
 
 namespace ash {
 
 StatusAreaWidgetDelegate::StatusAreaWidgetDelegate()
-    : focus_cycler_for_testing_(NULL),
-      alignment_(SHELF_ALIGNMENT_BOTTOM) {
+    : focus_cycler_for_testing_(nullptr),
+      alignment_(wm::SHELF_ALIGNMENT_BOTTOM) {
   // Allow the launcher to surrender the focus to another window upon
   // navigation completion by the user.
   set_allow_deactivate_on_esc(true);
   SetPaintToLayer(true);
   layer()->SetFillsBoundsOpaquely(false);
 }
 
 StatusAreaWidgetDelegate::~StatusAreaWidgetDelegate() {
 }
 
@@ skipping 101 matching lines @@
 void StatusAreaWidgetDelegate::ChildVisibilityChanged(View* child) {
   UpdateLayout();
 }
 
 void StatusAreaWidgetDelegate::UpdateWidgetSize() {
   if (GetWidget())
     GetWidget()->SetSize(GetPreferredSize());
 }
 
 }  // namespace ash