Remove references to IsNewAvatarMenu since the flag was removed.

chrome/chrome_tests_unit.gypi

 # Copyright 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': {
     'chrome_unit_tests_sources': [
       # histograms.xml is analyzed by AboutFlagsHistogramTest, so this
       # dependency is needed to make commit bots run unit_tests on
       # histograms.xml changes.
       '../tools/metrics/histograms/histograms.xml',
@@ skipping 310 matching lines @@
       'browser/ui/cocoa/bookmarks/bookmark_bubble_controller_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_button_cell_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_button_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_editor_base_controller_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_editor_controller_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_folder_target_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_menu_bridge_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_menu_cocoa_controller_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_model_observer_for_cocoa_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_name_folder_controller_unittest.mm',
-      'browser/ui/cocoa/bookmarks/bookmark_sync_promo_controller_unittest.mm',
       'browser/ui/cocoa/bookmarks/bookmark_tree_browser_cell_unittest.mm',
       'browser/ui/cocoa/browser/edit_search_engine_cocoa_controller_unittest.mm',
       'browser/ui/cocoa/browser/zoom_bubble_controller_unittest.mm',
       'browser/ui/cocoa/browser_window_cocoa_unittest.mm',
       'browser/ui/cocoa/browser_window_controller_unittest.mm',
       'browser/ui/cocoa/browser_window_layout_unittest.mm',
       'browser/ui/cocoa/bubble_view_unittest.mm',
       'browser/ui/cocoa/chrome_browser_window_unittest.mm',
       'browser/ui/cocoa/clickhold_button_cell_unittest.mm',
       'browser/ui/cocoa/cocoa_profile_test.h',
@@ skipping 2588 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }