[Try # 3] Scheduler refactoring to virtually eliminate redundant DoWorks

cc/test/ordered_simple_task_runner.h

Index: cc/test/ordered_simple_task_runner.h
diff --git a/cc/test/ordered_simple_task_runner.h b/cc/test/ordered_simple_task_runner.h
index 9620a96058df422e00c841a5512bca675422d9f0..1ba8e950217897f6a61f897bd2f6f7a495a02f50 100644
--- a/cc/test/ordered_simple_task_runner.h
+++ b/cc/test/ordered_simple_task_runner.h
@@ -130,6 +130,9 @@ class OrderedSimpleTaskRunner : public base::SingleThreadTaskRunner {
   // Advance Now() to the next task to run.
   base::Callback<bool(void)> AdvanceNow();
 
+  // Removes all tasks whose weak pointer has been revoked.
+  void RemoveCancelledTasks();
+
  protected:
   static bool TaskRunCountBelowCallback(size_t max_tasks, size_t* task_run);
   bool TaskExistedInitiallyCallback(