Make the pref_service in TestShellDelegate injectable.

ash/test/test_shell_delegate.h

 // 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.
 
 #ifndef ASH_TEST_TEST_SHELL_DELEGATE_H_
 #define ASH_TEST_TEST_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
 #include "ash/shell_delegate.h"
 #include "ash/test/test_session_state_delegate.h"
 #include "base/macros.h"
 
-class TestingPrefServiceSimple;
+class PrefService;
 
 namespace keyboard {
 class KeyboardUI;
 }
 
 namespace ash {
 namespace test {
 
 class ShelfInitializer;
 
 class TestShellDelegate : public ShellDelegate {
  public:
   TestShellDelegate();
   ~TestShellDelegate() override;
 
   void set_multi_profiles_enabled(bool multi_profiles_enabled) {
     multi_profiles_enabled_ = multi_profiles_enabled;
   }
 
+  void set_active_user_pref_service(PrefService* pref_service) {
+    active_user_pref_service_ = pref_service;
+  }
+
   // Overridden from ShellDelegate:
   ::service_manager::Connector* GetShellConnector() const override;
   bool IsIncognitoAllowed() const override;
   bool IsMultiProfilesEnabled() const override;
   bool IsRunningInForcedAppMode() const override;
   bool CanShowWindowForUser(WmWindow* window) const override;
   bool IsForceMaximizeOnFirstRun() const override;
   void PreInit() override;
   void PreShutdown() override;
   void Exit() override;
@@ skipping 22 matching lines @@
   void SetForceMaximizeOnFirstRun(bool maximize) {
     force_maximize_on_first_run_ = maximize;
   }
 
  private:
   int num_exit_requests_;
   bool multi_profiles_enabled_;
   bool force_maximize_on_first_run_;
   bool touchscreen_enabled_in_local_pref_;
   std::unique_ptr<ShelfInitializer> shelf_initializer_;
-  std::unique_ptr<TestingPrefServiceSimple> pref_service_;
+  PrefService* active_user_pref_service_;  // Not owned.
 
   DISALLOW_COPY_AND_ASSIGN(TestShellDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SHELL_DELEGATE_H_