Reduce the site engagement service public interface.

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 84 matching lines @@
       'browser/download/download_prefs_unittest.cc',
       'browser/download/download_query_unittest.cc',
       'browser/download/download_request_infobar_delegate_unittest.cc',
       'browser/download/download_request_limiter_unittest.cc',
       'browser/download/download_resource_throttle_unittest.cc',
       'browser/download/download_status_updater_unittest.cc',
       'browser/download/download_target_determiner_unittest.cc',
       'browser/download/download_ui_controller_unittest.cc',
       'browser/engagement/site_engagement_eviction_policy_unittest.cc',
       'browser/engagement/site_engagement_helper_unittest.cc',
+      'browser/engagement/site_engagement_score_unittest.cc',
       'browser/engagement/site_engagement_service_unittest.cc',
       'browser/enumerate_modules_model_unittest_win.cc',
       'browser/external_protocol/external_protocol_handler_unittest.cc',
       'browser/favicon/chrome_fallback_icon_client_unittest.cc',
       'browser/file_select_helper_unittest.cc',
       'browser/geolocation/geolocation_permission_context_unittest.cc',
       'browser/global_keyboard_shortcuts_mac_unittest.mm',
       'browser/google/google_update_settings_unittest.cc',
       'browser/google/google_update_win_unittest.cc',
       'browser/history/android/android_cache_database_unittest.cc',
@@ skipping 2882 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }