Revert of [Reland] Scheduler refactoring to virtually eliminate redundant DoWorks

third_party/WebKit/Source/platform/scheduler/base/real_time_domain.h

 // 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 THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_REAL_TIME_DOMAIN_H_
 #define THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_REAL_TIME_DOMAIN_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "platform/scheduler/base/time_domain.h"
 #include "public/platform/WebCommon.h"
 
 namespace blink {
 namespace scheduler {
 
 class BLINK_PLATFORM_EXPORT RealTimeDomain : public TimeDomain {
  public:
   explicit RealTimeDomain(const char* tracing_category);
   RealTimeDomain(TimeDomain::Observer* observer, const char* tracing_category);
   ~RealTimeDomain() override;
 
   // TimeDomain implementation:
   LazyNow CreateLazyNow() const override;
   base::TimeTicks Now() const override;
-  base::Optional<base::TimeDelta> DelayTillNextTask(LazyNow* lazy_now) override;
+  bool MaybeAdvanceTime() override;
   const char* GetName() const override;
 
  protected:
   void OnRegisterWithTaskQueueManager(
       TaskQueueManager* task_queue_manager) override;
   void RequestWakeup(base::TimeTicks now, base::TimeDelta delay) override;
   void AsValueIntoInternal(
       base::trace_event::TracedValue* state) const override;
 
  private:
   const char* tracing_category_;          // NOT OWNED
   TaskQueueManager* task_queue_manager_;  // NOT OWNED
 
   DISALLOW_COPY_AND_ASSIGN(RealTimeDomain);
 };
 
 }  // namespace scheduler
 }  // namespace blink
 
 #endif  // THIRD_PARTY_WEBKIT_SOURCE_PLATFORM_SCHEDULER_BASE_REAL_TIME_DOMAIN_H_