Converts ash/wm/mru_window_tracker_unittest.cc to use AshTest

ash/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 assert(use_aura)
@@ skipping 1287 matching lines @@
     "wm/dock/docked_window_layout_manager_unittest.cc",
     "wm/dock/docked_window_resizer_unittest.cc",
     "wm/drag_window_resizer_unittest.cc",
     "wm/gestures/overview_gesture_handler_unittest.cc",
     "wm/immersive_fullscreen_controller_unittest.cc",
     "wm/lock_layout_manager_unittest.cc",
     "wm/lock_state_controller_unittest.cc",
     "wm/maximize_mode/accelerometer_test_data_literals.cc",
     "wm/maximize_mode/maximize_mode_controller_unittest.cc",
     "wm/maximize_mode/maximize_mode_window_manager_unittest.cc",
-    "wm/mru_window_tracker_unittest.cc",
     "wm/overlay_event_filter_unittest.cc",
     "wm/overview/window_selector_unittest.cc",
     "wm/panels/panel_layout_manager_unittest.cc",
     "wm/panels/panel_window_resizer_unittest.cc",
     "wm/resize_shadow_and_cursor_unittest.cc",
     "wm/root_window_layout_manager_unittest.cc",
     "wm/screen_dimmer_unittest.cc",
     "wm/screen_pinning_controller_unittest.cc",
     "wm/session_state_animator_impl_unittest.cc",
     "wm/stacking_controller_unittest.cc",
@@ skipping 161 matching lines @@
   if (is_win) {
     configs -= [ "//build/config/win:console" ]
     configs += [ "//build/config/win:windowed" ]
     deps += [ "//sandbox" ]
   }
 
   if (is_chromeos) {
     deps += [ "//device/bluetooth" ]
   }
 }