Automated IWYU fix for TaskRunner includes.

chrome/browser/password_manager/password_store_factory.cc

 // 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.
 
 #include "chrome/browser/password_manager/password_store_factory.h"
 
 #include <memory>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sync/glue/sync_start_util.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "chrome/browser/web_data_service_factory.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/browser_sync/profile_sync_service.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
@@ skipping 331 matching lines @@
         break;
       case LIBSECRET:
         usage = OTHER_LIBSECRET;
         break;
     }
   }
   UMA_HISTOGRAM_ENUMERATION("PasswordManager.LinuxBackendStatistics", usage,
                             MAX_BACKEND_USAGE_VALUE);
 }
 #endif