Make PrefService available in *ash

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;
+
 namespace keyboard {
 class KeyboardUI;
 }
 
 namespace ash {
 namespace test {
 
 class ShelfInitializer;
 
 class TestShellDelegate : public ShellDelegate {
@@ skipping 22 matching lines @@
   SystemTrayDelegate* CreateSystemTrayDelegate() override;
   std::unique_ptr<WallpaperDelegate> CreateWallpaperDelegate() override;
   TestSessionStateDelegate* CreateSessionStateDelegate() override;
   AccessibilityDelegate* CreateAccessibilityDelegate() override;
   std::unique_ptr<PaletteDelegate> CreatePaletteDelegate() override;
   ui::MenuModel* CreateContextMenu(WmShelf* wm_shelf,
                                    const ShelfItem* item) override;
   GPUSupport* CreateGPUSupport() override;
   base::string16 GetProductName() const override;
   gfx::Image GetDeprecatedAcceleratorImage() const override;
-
+  PrefService* GetActiveUserPrefService() const override;
   bool IsTouchscreenEnabledInPrefs(bool use_local_state) const override;
   void SetTouchscreenEnabledInPrefs(bool enabled,
                                     bool use_local_state) override;
   void UpdateTouchscreenStatusFromPrefs() override;
 
   int num_exit_requests() const { return num_exit_requests_; }
 
   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_;
 
   DISALLOW_COPY_AND_ASSIGN(TestShellDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SHELL_DELEGATE_H_