Field trial removing tiles from NTP if URL is already open - for 1993 clients

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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 877 matching lines @@
         'browser/history/expire_history_backend_unittest.cc',
         'browser/history/history_backend_unittest.cc',
         'browser/history/history_database_unittest.cc',
         'browser/history/history_querying_unittest.cc',
         'browser/history/history_types_unittest.cc',
         'browser/history/history_unittest.cc',
         'browser/history/history_unittest_base.cc',
         'browser/history/history_unittest_base.h',
         'browser/history/in_memory_url_index_types_unittest.cc',
         'browser/history/in_memory_url_index_unittest.cc',
+        'browser/history/most_visited_tiles_experiment_unittest.cc',
         'browser/history/query_parser_unittest.cc',
         'browser/history/scored_history_match_unittest.cc',
         'browser/history/select_favicon_frames_unittest.cc',
         'browser/history/shortcuts_backend_unittest.cc',
         'browser/history/shortcuts_database_unittest.cc',
         'browser/history/snippet_unittest.cc',
         'browser/history/text_database_manager_unittest.cc',
         'browser/history/text_database_unittest.cc',
         'browser/history/thumbnail_database_unittest.cc',
         'browser/history/top_sites_database_unittest.cc',
@@ skipping 1742 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }