Converts MaximizeModeWindowManager to use ash/common types

ash/mus/root_window_controller.cc

 // Copyright 2016 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/mus/root_window_controller.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <sstream>
@@ skipping 217 matching lines @@
   layout_managers_[status_container->mus_window()].reset(
       new StatusLayoutManager(status_container->mus_window()));
 
   WmWindowMus* default_container =
       GetWindowByShellWindowId(kShellWindowId_DefaultContainer);
   // WorkspaceLayoutManager is not a mash::wm::LayoutManager (it's a
   // wm::LayoutManager), so it can't be in |layout_managers_|.
   std::unique_ptr<WorkspaceLayoutManagerDelegateImpl>
       workspace_layout_manager_delegate(new WorkspaceLayoutManagerDelegateImpl(
           wm_root_window_controller_.get()));
+  workspace_layout_manager_ = new WorkspaceLayoutManager(
+      default_container, std::move(workspace_layout_manager_delegate));
   default_container->SetLayoutManager(
-      base::WrapUnique(new WorkspaceLayoutManager(
-          default_container, std::move(workspace_layout_manager_delegate))));
+      base::WrapUnique(workspace_layout_manager_));
 
   WmWindowMus* docked_container =
       GetWindowByShellWindowId(kShellWindowId_DockedContainer);
   docked_container->SetLayoutManager(
       base::WrapUnique(new DockedWindowLayoutManager(docked_container)));
 
   WmWindowMus* panel_container =
       GetWindowByShellWindowId(kShellWindowId_PanelContainer);
   panel_container->SetLayoutManager(
       base::WrapUnique(new PanelLayoutManager(panel_container)));
 }
 
 }  // namespace mus
 }  // namespace ash