Revert of Run task queue manager work in batches

content/renderer/scheduler/renderer_scheduler_impl.cc

Index: content/renderer/scheduler/renderer_scheduler_impl.cc
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.cc b/content/renderer/scheduler/renderer_scheduler_impl.cc
index fbd8cbe605c07dfd3b1a47f62f29c45e33b85fee..7f006144fda6759d20b349cf7ce9c70627c0ace2 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.cc
+++ b/content/renderer/scheduler/renderer_scheduler_impl.cc
@@ -45,8 +45,6 @@ RendererSchedulerImpl::RendererSchedulerImpl(
       CONTROL_TASK_QUEUE, RendererTaskQueueSelector::CONTROL_PRIORITY);
   renderer_task_queue_selector_->DisableQueue(IDLE_TASK_QUEUE);
   task_queue_manager_->SetAutoPump(IDLE_TASK_QUEUE, false);
-  // TODO(skyostil): Increase this to 4 (crbug.com/444764).
-  task_queue_manager_->SetWorkBatchSize(1);
 
   for (size_t i = 0; i < TASK_QUEUE_COUNT; i++) {
     task_queue_manager_->SetQueueName(
@@ -257,15 +255,8 @@ void RendererSchedulerImpl::EndIdlePeriod() {
   renderer_task_queue_selector_->DisableQueue(IDLE_TASK_QUEUE);
 }
 
-void RendererSchedulerImpl::SetTimeSourceForTesting(
-    scoped_refptr<cc::TestNowSource> time_source) {
-  main_thread_checker_.CalledOnValidThread();
-  time_source_ = time_source;
-  task_queue_manager_->SetTimeSourceForTesting(time_source);
-}
-
 base::TimeTicks RendererSchedulerImpl::Now() const {
-  return UNLIKELY(time_source_) ? time_source_->Now() : base::TimeTicks::Now();
+  return gfx::FrameTime::Now();
 }
 
 RendererSchedulerImpl::PollableNeedsUpdateFlag::PollableNeedsUpdateFlag(