Remove Hung plugin detector

chrome/chrome_common.gypi

 # Copyright (c) 2013 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': {
     # File lists shared with GN build.
     'chrome_common_sources': [
       'common/all_messages.h',
       'common/attrition_experiments.h',
@@ skipping 88 matching lines @@
       'common/url_constants.cc',
       'common/url_constants.h',
       'common/v8_breakpad_support_win.cc',
       'common/v8_breakpad_support_win.h',
       'common/variations/variations_util.cc',
       'common/variations/variations_util.h',
       'common/web_application_info.cc',
       'common/web_application_info.h',
       'common/widevine_cdm_constants.cc',
       'common/widevine_cdm_constants.h',
-      'common/worker_thread_ticker.cc',
-      'common/worker_thread_ticker.h',
     ],
     'chrome_common_extensions_sources': [
       'common/cast_messages.cc',
       'common/cast_messages.h',
       'common/extensions/api/commands/commands_handler.cc',
       'common/extensions/api/commands/commands_handler.h',
       'common/extensions/api/extension_action/action_info.cc',
       'common/extensions/api/extension_action/action_info.h',
       'common/extensions/api/notifications/notification_style.cc',
       'common/extensions/api/notifications/notification_style.h',
@@ skipping 516 matching lines @@
       ],
       'sources': [
         'common/resource_usage_reporter.mojom',
       ],
       'dependencies': [
         '../mojo/mojo_public.gyp:mojo_cpp_bindings',
       ],
     },
   ],
 }