[Mac] Do not leave artifacts when using history navigation gestures.

chrome/chrome_tests.gypi

 # 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1757 matching lines @@
         'browser/ui/cocoa/find_bar/find_bar_view_unittest.mm',
         'browser/ui/cocoa/find_pasteboard_unittest.mm',
         'browser/ui/cocoa/first_run_bubble_controller_unittest.mm',
         'browser/ui/cocoa/floating_bar_backing_view_unittest.mm',
         'browser/ui/cocoa/framed_browser_window_unittest.mm',
         'browser/ui/cocoa/fullscreen_window_unittest.mm',
         'browser/ui/cocoa/fullscreen_exit_bubble_controller_unittest.mm',
         'browser/ui/cocoa/gradient_button_cell_unittest.mm',
         'browser/ui/cocoa/history_menu_bridge_unittest.mm',
         'browser/ui/cocoa/history_menu_cocoa_controller_unittest.mm',
+        'browser/ui/cocoa/history_overlay_controller_unittest.mm',
         'browser/ui/cocoa/hover_image_button_unittest.mm',
         'browser/ui/cocoa/hung_renderer_controller_unittest.mm',
         'browser/ui/cocoa/hyperlink_button_cell_unittest.mm',
         'browser/ui/cocoa/hyperlink_text_view_unittest.mm',
         'browser/ui/cocoa/image_button_cell_unittest.mm',
         'browser/ui/cocoa/image_utils_unittest.mm',
         'browser/ui/cocoa/info_bubble_view_unittest.mm',
         'browser/ui/cocoa/info_bubble_window_unittest.mm',
         'browser/ui/cocoa/infobars/infobar_container_controller_unittest.mm',
         'browser/ui/cocoa/infobars/infobar_controller_unittest.mm',
@@ skipping 2972 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }