Revert of Worker: Introduce per-global-scope task scheduler

third_party/WebKit/Source/platform/scheduler/child/worker_global_scope_scheduler.h

Index: third_party/WebKit/Source/platform/scheduler/child/worker_global_scope_scheduler.h
diff --git a/third_party/WebKit/Source/platform/scheduler/child/worker_global_scope_scheduler.h b/third_party/WebKit/Source/platform/scheduler/child/worker_global_scope_scheduler.h
deleted file mode 100644
index 5e3c7fbd39a4f5f306eb68173f06316b5080bad7..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/platform/scheduler/child/worker_global_scope_scheduler.h
+++ /dev/null
@@ -1,49 +0,0 @@
-// Copyright 2017 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.
-
-#ifndef THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_WORKER_GLOBAL_SCOPE_SCHEDULER_H_
-#define THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_WORKER_GLOBAL_SCOPE_SCHEDULER_H_
-
-#include "platform/scheduler/child/web_task_runner_impl.h"
-#include "public/platform/WebCommon.h"
-#include "public/platform/scheduler/base/task_queue.h"
-
-namespace blink {
-namespace scheduler {
-
-class WorkerScheduler;
-
-// A scheduler provides per-global-scope task queues. This is constructed when a
-// global scope is created and destructed when it's closed.
-//
-// Unless stated otherwise, all methods must be called on the worker thread.
-class BLINK_PLATFORM_EXPORT WorkerGlobalScopeScheduler {
- public:
-  explicit WorkerGlobalScopeScheduler(WorkerScheduler* worker_scheduler);
-  ~WorkerGlobalScopeScheduler();
-
-  // Unregisters the task queues and cancels tasks in them.
-  void Dispose();
-
-  // Returns the WebTaskRunner for tasks which should never get throttled. This
-  // can be called from any thread.
-  RefPtr<WebTaskRunner> UnthrottledTaskRunner() {
-    return unthrottled_task_runner_;
-  }
-
-  // TODO(nhiroki): Add mechanism to throttle/suspend tasks in response to the
-  // state of the parent document (https://crbug.com/670534).
-
- private:
-  RefPtr<WebTaskRunnerImpl> unthrottled_task_runner_;
-
-#if DCHECK_IS_ON()
-  bool is_disposed_ = false;
-#endif
-};
-
-}  // namespace scheduler
-}  // namespace blink
-
-#endif  // THIRD_PARTY_WEBKIT_PUBLIC_PLATFORM_SCHEDULER_WORKER_GLOBAL_SCOPE_SCHEDULER_H_