Revert of Adds TimeDomains to the TaskQueueManager

components/scheduler/base/virtual_time_domain.h

Index: components/scheduler/base/virtual_time_domain.h
diff --git a/components/scheduler/base/virtual_time_domain.h b/components/scheduler/base/virtual_time_domain.h
deleted file mode 100644
index 2e384144d4c20918ca08cb3ffeb1c4bc6a080389..0000000000000000000000000000000000000000
--- a/components/scheduler/base/virtual_time_domain.h
+++ /dev/null
@@ -1,45 +0,0 @@
-// Copyright 2015 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 COMPONENTS_SCHEDULER_BASE_VIRTUAL_TIME_DOMAIN_H_
-#define COMPONENTS_SCHEDULER_BASE_VIRTUAL_TIME_DOMAIN_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "components/scheduler/base/time_domain.h"
-#include "components/scheduler/scheduler_export.h"
-
-namespace scheduler {
-class TaskQueueManagerDelegate;
-
-class SCHEDULER_EXPORT VirtualTimeDomain : public TimeDomain {
- public:
-  VirtualTimeDomain(base::TimeTicks initial_time);
-
-  // TimeDomain implementation:
-  LazyNow CreateLazyNow() override;
-  bool MaybeAdvanceTime() override;
-  const char* GetName() const override;
-
-  // Advances this time domain to |now|. NOTE |now| is supposed to be
-  // monotonically increasing.
-  void AdvanceTo(base::TimeTicks now);
-
- protected:
-  void RequestWakeup(base::TimeDelta delay) override;
-  void AsValueIntoInternal(
-      base::trace_event::TracedValue* state) const override;
-
- private:
-  mutable base::Lock lock_;  // Protects |now_|.
-  base::TimeTicks now_;
-
-  ~VirtualTimeDomain() override;
-
-  DISALLOW_COPY_AND_ASSIGN(VirtualTimeDomain);
-};
-
-}  // namespace scheduler
-
-#endif  // COMPONENTS_SCHEDULER_BASE_VIRTUAL_TIME_DOMAIN_H_