[Clean-up] Replace the final straggler use of MockTimeProvider with Clock.

base/base.gyp

 # Copyright (c) 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': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 914 matching lines @@
         'test/launcher/test_result.h',
         'test/launcher/test_results_tracker.cc',
         'test/launcher/test_results_tracker.h',
         'test/launcher/unit_test_launcher.cc',
         'test/launcher/unit_test_launcher.h',
         'test/launcher/unit_test_launcher_ios.cc',
         'test/mock_chrome_application_mac.h',
         'test/mock_chrome_application_mac.mm',
         'test/mock_devices_changed_observer.cc',
         'test/mock_devices_changed_observer.h',
-        'test/mock_time_provider.cc',
-        'test/mock_time_provider.h',
         'test/multiprocess_test.cc',
         'test/multiprocess_test.h',
         'test/multiprocess_test_android.cc',
         'test/null_task_runner.cc',
         'test/null_task_runner.h',
         'test/opaque_ref_counted.cc',
         'test/opaque_ref_counted.h',
         'test/perf_log.cc',
         'test/perf_log.h',
         'test/perf_test_suite.cc',
@@ skipping 611 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }