[Most Visited] Removing Most Visited Tiles experiment code, which is obsolete.

chrome/chrome_browser.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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 541 matching lines @@
       'browser/history/history_tab_helper.cc',
       'browser/history/history_tab_helper.h',
       'browser/history/history_types.cc',
       'browser/history/history_types.h',
       'browser/history/in_memory_history_backend.cc',
       'browser/history/in_memory_history_backend.h',
       'browser/history/in_memory_url_index.cc',
       'browser/history/in_memory_url_index.h',
       'browser/history/in_memory_url_index_types.cc',
       'browser/history/in_memory_url_index_types.h',
-      'browser/history/most_visited_tiles_experiment.cc',
-      'browser/history/most_visited_tiles_experiment.h',
       'browser/history/page_usage_data.cc',
       'browser/history/page_usage_data.h',
       'browser/history/scored_history_match.cc',
       'browser/history/scored_history_match.h',
       'browser/history/shortcuts_database.cc',
       'browser/history/shortcuts_database.h',
       'browser/history/thumbnail_database.cc',
       'browser/history/thumbnail_database.h',
       'browser/history/top_sites.cc',
       'browser/history/top_sites.h',
@@ skipping 3038 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }