chromeos: convert remaining AshTest usage to AshTestBase

ash/mus/window_manager_application.h

 // Copyright 2015 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.
 
 #ifndef ASH_MUS_WINDOW_MANAGER_APPLICATION_H_
 #define ASH_MUS_WINDOW_MANAGER_APPLICATION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 53 matching lines @@
       Config ash_config = Config::MASH,
       std::unique_ptr<ash::ShellDelegate> shell_delegate = nullptr);
   ~WindowManagerApplication() override;
 
   WindowManager* window_manager() { return window_manager_.get(); }
 
   service_manager::Connector* GetConnector();
 
  private:
   friend class ash::test::AshTestHelper;
-  friend class WmTestBase;
-  friend class WmTestHelper;
 
   // If |init_network_handler| is true, chromeos::NetworkHandler is initialized.
   void InitWindowManager(
       std::unique_ptr<aura::WindowTreeClient> window_tree_client,
       const scoped_refptr<base::SequencedWorkerPool>& blocking_pool,
       bool init_network_handler);
 
   // Initializes lower-level OS-specific components (e.g. D-Bus services).
   void InitializeComponents(bool init_network_handler);
   void ShutdownComponents();
@@ skipping 25 matching lines @@
 
   const Config ash_config_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowManagerApplication);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_WINDOW_MANAGER_APPLICATION_H_