TaskScheduler: Replace the SchedulerServiceThread with a base::Thread.

base/BUILD.gn

 # 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.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
@@ skipping 765 matching lines @@
     #"sys_info_openbsd.cc",  # Unused in Chromium build.
     "sys_info_posix.cc",
     "sys_info_win.cc",
     "system_monitor/system_monitor.cc",
     "system_monitor/system_monitor.h",
     "task/cancelable_task_tracker.cc",
     "task/cancelable_task_tracker.h",
     "task_runner.cc",
     "task_runner.h",
     "task_runner_util.h",
-    "task_scheduler/delayed_task_manager.cc",
-    "task_scheduler/delayed_task_manager.h",
     "task_scheduler/post_task.cc",
     "task_scheduler/post_task.h",
     "task_scheduler/priority_queue.cc",
     "task_scheduler/priority_queue.h",
     "task_scheduler/scheduler_lock.h",
     "task_scheduler/scheduler_lock_impl.cc",
     "task_scheduler/scheduler_lock_impl.h",
-    "task_scheduler/scheduler_service_thread.cc",
-    "task_scheduler/scheduler_service_thread.h",
     "task_scheduler/scheduler_worker.cc",
     "task_scheduler/scheduler_worker.h",
     "task_scheduler/scheduler_worker_pool.h",
     "task_scheduler/scheduler_worker_pool_impl.cc",
     "task_scheduler/scheduler_worker_pool_impl.h",
     "task_scheduler/scheduler_worker_pool_params.cc",
     "task_scheduler/scheduler_worker_pool_params.h",
     "task_scheduler/scheduler_worker_stack.cc",
     "task_scheduler/scheduler_worker_stack.h",
     "task_scheduler/sequence.cc",
@@ skipping 1116 matching lines @@
     "synchronization/condition_variable_unittest.cc",
     "synchronization/lock_unittest.cc",
     "synchronization/read_write_lock_unittest.cc",
     "synchronization/waitable_event_unittest.cc",
     "synchronization/waitable_event_watcher_unittest.cc",
     "sys_byteorder_unittest.cc",
     "sys_info_unittest.cc",
     "system_monitor/system_monitor_unittest.cc",
     "task/cancelable_task_tracker_unittest.cc",
     "task_runner_util_unittest.cc",
-    "task_scheduler/delayed_task_manager_unittest.cc",
     "task_scheduler/priority_queue_unittest.cc",
     "task_scheduler/scheduler_lock_unittest.cc",
-    "task_scheduler/scheduler_service_thread_unittest.cc",
     "task_scheduler/scheduler_worker_pool_impl_unittest.cc",
     "task_scheduler/scheduler_worker_stack_unittest.cc",
     "task_scheduler/scheduler_worker_unittest.cc",
     "task_scheduler/sequence_sort_key_unittest.cc",
     "task_scheduler/sequence_unittest.cc",
     "task_scheduler/task_scheduler_impl_unittest.cc",
     "task_scheduler/task_tracker_unittest.cc",
     "task_scheduler/task_unittest.cc",
     "task_scheduler/test_task_factory.cc",
     "task_scheduler/test_task_factory.h",
@@ skipping 502 matching lines @@
     testonly = true
     deps = [
       ":base_java",
     ]
     java_files = [
       "test/android/java/src/org/chromium/base/ContentUriTestUtils.java",
       "test/android/java/src/org/chromium/base/TestSystemMessageHandler.java",
     ]
   }
 }