Componentize TopSites, TopSitesBackend, TopSitesDatabase

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': [
       '../components/autofill/content/renderer/test_password_autofill_agent.cc',
       '../components/autofill/content/renderer/test_password_autofill_agent.h',
       '../components/autofill/content/renderer/test_password_generation_agent.cc',
       '../components/autofill/content/renderer/test_password_generation_agent.h',
@@ skipping 95 matching lines @@
       'browser/history/android/urls_sql_handler_unittest.cc',
       'browser/history/android/visit_sql_handler_unittest.cc',
       '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_unittest.cc',
       'browser/history/in_memory_url_index_unittest.cc',
       'browser/history/scored_history_match_unittest.cc',
       'browser/history/thumbnail_database_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/web_history_service_unittest.cc',
       'browser/image_holder_unittest.cc',
       'browser/internal_auth_unittest.cc',
       'browser/install_verification/win/imported_module_verification_unittest.cc',
       'browser/install_verification/win/loaded_module_verification_unittest.cc',
       'browser/install_verification/win/loaded_modules_snapshot_unittest.cc',
       'browser/install_verification/win/module_ids_unittest.cc',
       'browser/install_verification/win/module_info_unittest.cc',
@@ skipping 2616 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }