Revert of Run task queue manager work in batches

content/renderer/scheduler/renderer_scheduler_impl_unittest.cc

Index: content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
diff --git a/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc b/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
index ee16d04bece365535469dce5fa4acdbcb3be8ca3..36c85d3cf698afa5e30ae98609ae864efea56d30 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
+++ b/content/renderer/scheduler/renderer_scheduler_impl_unittest.cc
@@ -12,18 +12,31 @@
 
 namespace content {
 
+class RendererSchedulerImplForTest : public RendererSchedulerImpl {
+ public:
+  RendererSchedulerImplForTest(
+      scoped_refptr<cc::OrderedSimpleTaskRunner> task_runner,
+      scoped_refptr<cc::TestNowSource> clock)
+      : RendererSchedulerImpl(task_runner), clock_(clock) {}
+  ~RendererSchedulerImplForTest() override {}
+
+ protected:
+  base::TimeTicks Now() const override { return clock_->Now(); }
+
+ private:
+  scoped_refptr<cc::TestNowSource> clock_;
+};
+
 class RendererSchedulerImplTest : public testing::Test {
  public:
   RendererSchedulerImplTest()
       : clock_(cc::TestNowSource::Create(5000)),
         mock_task_runner_(new cc::OrderedSimpleTaskRunner(clock_, false)),
-        scheduler_(new RendererSchedulerImpl(mock_task_runner_)),
+        scheduler_(new RendererSchedulerImplForTest(mock_task_runner_, clock_)),
         default_task_runner_(scheduler_->DefaultTaskRunner()),
         compositor_task_runner_(scheduler_->CompositorTaskRunner()),
         loading_task_runner_(scheduler_->LoadingTaskRunner()),
-        idle_task_runner_(scheduler_->IdleTaskRunner()) {
-    scheduler_->SetTimeSourceForTesting(clock_);
-  }
+        idle_task_runner_(scheduler_->IdleTaskRunner()) {}
   ~RendererSchedulerImplTest() override {}
 
   void RunUntilIdle() { mock_task_runner_->RunUntilIdle(); }