[Most Visited] Removing Most Visited Tiles experiment code, which is obsolete.

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 992 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/scored_history_match_unittest.cc',
         'browser/history/select_favicon_frames_unittest.cc',
         'browser/history/shortcuts_database_unittest.cc',
         'browser/history/thumbnail_database_unittest.cc',
         'browser/history/top_sites_cache_unittest.cc',
         'browser/history/top_sites_database_unittest.cc',
         'browser/history/top_sites_impl_unittest.cc',
         'browser/history/typed_url_syncable_service_unittest.cc',
         'browser/history/url_utils_unittest.cc',
         'browser/history/visit_database_unittest.cc',
@@ skipping 1847 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }