mash: Remove WorkspaceLayoutManagerDelegate.

ash/common/wm/always_on_top_controller.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/common/wm/always_on_top_controller.h"
 
 #include "ash/common/shell_window_ids.h"
 #include "ash/common/wm/workspace/workspace_layout_manager.h"
-#include "ash/common/wm/workspace/workspace_layout_manager_delegate.h"
 #include "ash/common/wm_window.h"
 #include "ash/common/wm_window_property.h"
 #include "base/memory/ptr_util.h"
 
 namespace ash {
 
 AlwaysOnTopController::AlwaysOnTopController(WmWindow* viewport)
     : always_on_top_container_(viewport) {
   always_on_top_container_->SetLayoutManager(
-      base::WrapUnique(new WorkspaceLayoutManager(viewport, nullptr)));
+      base::MakeUnique<WorkspaceLayoutManager>(viewport));
   // Container should be empty.
   DCHECK(always_on_top_container_->GetChildren().empty());
   always_on_top_container_->AddObserver(this);
 }
 
 AlwaysOnTopController::~AlwaysOnTopController() {
   if (always_on_top_container_)
     always_on_top_container_->RemoveObserver(this);
 }
 
@@ skipping 38 matching lines @@
 }
 
 void AlwaysOnTopController::OnWindowDestroying(WmWindow* window) {
   if (window == always_on_top_container_) {
     always_on_top_container_->RemoveObserver(this);
     always_on_top_container_ = nullptr;
   }
 }
 
 }  // namespace ash