Purge memory before suspending timer queues when backgrounded.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
index 26162de46a67c7f293d0487ba20eff7db9a3657f..b58cda5902724303caf59444897d02a80c3072f9 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
@@ -123,7 +123,6 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   void Shutdown() override;
   void SuspendTimerQueue() override;
   void ResumeTimerQueue() override;
-  void SetTimerQueueSuspensionWhenBackgroundedEnabled(bool enabled) override;
   void SetTopLevelBlameContext(
       base::trace_event::BlameContext* blame_context) override;
   void SetRAILModeObserver(RAILModeObserver* observer) override;
@@ -300,11 +299,6 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   // defined by RAILS.
   static const int kRailsResponseTimeMillis = 50;
 
-  // The amount of time to wait before suspending shared timers after the
-  // renderer has been backgrounded. This is used only if background suspension
-  // of shared timers is enabled.
-  static const int kSuspendTimersWhenBackgroundedDelayMillis = 5 * 60 * 1000;
-
   // The time we should stay in a priority-escalated mode after a call to
   // DidAnimateForInputOnCompositorThread().
   static const int kFlingEscalationLimitMillis = 100;
@@ -402,7 +396,6 @@ class BLINK_PLATFORM_EXPORT RendererSchedulerImpl
   base::Closure update_policy_closure_;
   DeadlineTaskRunner delayed_update_policy_runner_;
   CancelableClosureHolder end_renderer_hidden_idle_period_closure_;
-  CancelableClosureHolder suspend_timers_when_backgrounded_closure_;
 
   using SeqLockQueueingTimeEstimator =
       device::SharedMemorySeqLockBuffer<QueueingTimeEstimator>;