Move throttling of background timers into the renderer scheduler

components/scheduler/child/web_scheduler_impl.h

Index: components/scheduler/child/web_scheduler_impl.h
diff --git a/components/scheduler/child/web_scheduler_impl.h b/components/scheduler/child/web_scheduler_impl.h
index 84933acb9ceac9cc8e1368567948054ced2cf261..724491ff656debfaba15cfb75b1dc14abf9d56ee 100644
--- a/components/scheduler/child/web_scheduler_impl.h
+++ b/components/scheduler/child/web_scheduler_impl.h
@@ -52,11 +52,6 @@ class SCHEDULER_EXPORT WebSchedulerImpl : public blink::WebScheduler {
   void removePendingNavigation() override {}
   void onNavigationStarted() override {}
 
-  // TODO(alexclarke): Remove when possible.
-  void postTimerTaskAt(const blink::WebTraceLocation& location,
-                       blink::WebTaskRunner::Task* task,
-                       double monotonicTime) override;
-
  private:
   static void runIdleTask(scoped_ptr<blink::WebThread::IdleTask> task,
                           base::TimeTicks deadline);