Rename TaskRunner::RunsTasksOnCurrentThread() in //base

Renamed TaskRunner::RunsTasksOnCurrentThread() to

TaskRunner: :RunsTasksInCurrentSequence() in //base
Bug: 665062
Change-Id: I185b0b0948b5a821af233f60830d5c89743673f8
Reviewed-on: https://chromium-review.googlesource.com/563225
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#489347}

• base/debug/activity_tracker.cc[diff]
• base/files/file_path_watcher_fsevents.cc[diff]
• base/files/file_path_watcher_kqueue.cc[diff]
• base/files/file_path_watcher_linux.cc[diff]
• base/files/file_path_watcher_win.cc[diff]
• base/memory/ref_counted_delete_on_sequence.h[diff]
• base/observer_list_threadsafe.h[diff]
• base/observer_list_unittest.cc[diff]
• base/single_thread_task_runner.h[diff]
• base/task/cancelable_task_tracker.cc[diff]
• base/task_runner.h[diff]
• base/task_scheduler/scheduler_single_thread_task_runner_manager_unittest.cc[diff]
• base/task_scheduler/scheduler_worker_pool_impl_unittest.cc[diff]
• base/task_scheduler/task_scheduler_impl_unittest.cc[diff]
• base/task_scheduler/test_task_factory.cc[diff]
• base/task_scheduler/test_task_factory.h[diff]
• base/test/scoped_mock_time_message_loop_task_runner.cc[diff]
• base/test/task_runner_test_template.cc[diff]
• base/test/task_runner_test_template.h[diff]
• base/test/test_mock_time_task_runner.cc[diff]
• base/test/test_mock_time_task_runner.h[diff]
• base/threading/sequenced_task_runner_handle.cc[diff]
• base/threading/sequenced_worker_pool.cc[diff]
• base/threading/sequenced_worker_pool_unittest.cc[diff]
• base/timer/timer_unittest.cc[diff]
• base/trace_event/memory_dump_manager.cc[diff]
• base/trace_event/memory_dump_manager_unittest.cc[diff]
• base/trace_event/memory_dump_scheduler_unittest.cc[diff]
• base/win/object_watcher.cc[diff]