Add support for variations controlled overriding UI strings to the variations service.

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 1067 matching lines @@
         'browser/metrics/compression_utils_unittest.cc',
         'browser/metrics/extension_metrics_unittest.cc',
         'browser/metrics/machine_id_provider_win_unittest.cc',
         'browser/metrics/metrics_log_unittest.cc',
         'browser/metrics/metrics_reporting_scheduler_unittest.cc',
         'browser/metrics/metrics_service_unittest.cc',
         'browser/metrics/metrics_state_manager_unittest.cc',
         'browser/metrics/thread_watcher_unittest.cc',
         'browser/metrics/thread_watcher_android_unittest.cc',
         'browser/metrics/time_ticks_experiment_unittest.cc',
-        'browser/metrics/variations/variations_http_header_provider_unittest.cc',

[Alexei Svitkine (slow), 2014/07/17 13:43:31]

This diff looks weird. Do you need to rebase?

[jwd, 2014/07/18 20:10:29]

Done.

+        'browser/metrics/variations/generated_resources_map_lookup_unittest.cc',
         'browser/metrics/variations/variations_request_scheduler_mobile_unittest.cc',
         'browser/metrics/variations/variations_request_scheduler_unittest.cc',
         'browser/metrics/variations/variations_seed_store_unittest.cc',
         'browser/metrics/variations/variations_service_unittest.cc',
         'browser/net/chrome_fraudulent_certificate_reporter_unittest.cc',
         'browser/net/chrome_network_delegate_unittest.cc',
         'browser/net/client_hints_unittest.cc',
         'browser/net/connection_tester_unittest.cc',
         'browser/net/dns_probe_runner_unittest.cc',
         'browser/net/dns_probe_service_unittest.cc',
@@ skipping 1746 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/unit_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }