Moves ImmersiveFullscreenController::SetupForTest into test class

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     # These files lists are shared with the GN build.
     'ash_sources': [
       'accelerators/accelerator_commands_aura.cc',
@@ skipping 810 matching lines @@
       'test/ash_test_helper.cc',
       'test/ash_test_helper.h',
       'test/ash_test_views_delegate.cc',
       'test/ash_test_views_delegate.h',
       'test/child_modal_window.cc',
       'test/child_modal_window.h',
       'test/cursor_manager_test_api.cc',
       'test/cursor_manager_test_api.h',
       'test/display_manager_test_api.cc',
       'test/display_manager_test_api.h',
+      'test/immersive_fullscreen_controller_test_api.cc',
+      'test/immersive_fullscreen_controller_test_api.h',
       'test/mirror_window_test_api.cc',
       'test/mirror_window_test_api.h',
       'test/overflow_bubble_view_test_api.cc',
       'test/overflow_bubble_view_test_api.h',
       'test/shelf_button_pressed_metric_tracker_test_api.cc',
       'test/shelf_button_pressed_metric_tracker_test_api.h',
       'test/shelf_test_api.h',
       'test/shelf_view_test_api.cc',
       'test/shelf_view_test_api.h',
       'test/shell_test_api.cc',
@@ skipping 650 matching lines @@
                   '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
                 ],
               }
             ],
           ],
         },
       ],
     }],
   ],
 }