Remove usage of FOR_EACH_OBSERVER macro in platform/scheduler

third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc

Index: third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
index 0785e8d223049ce92bd458346d1d60784a432023..1ed68f4ad32617bab87ea9599bc6a0e8b18f7eb5 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
@@ -507,17 +507,15 @@ void TaskQueueImpl::NotifyWillProcessTask(
   DCHECK(should_notify_observers_);
   if (main_thread_only().blame_context)
     main_thread_only().blame_context->Enter();
-  FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver,
-                    main_thread_only().task_observers,
-                    WillProcessTask(pending_task));
+  for (auto& observer : main_thread_only().task_observers)
+    observer.WillProcessTask(pending_task);
 }
 
 void TaskQueueImpl::NotifyDidProcessTask(
     const base::PendingTask& pending_task) {
   DCHECK(should_notify_observers_);
-  FOR_EACH_OBSERVER(base::MessageLoop::TaskObserver,
-                    main_thread_only().task_observers,
-                    DidProcessTask(pending_task));
+  for (auto& observer : main_thread_only().task_observers)
+    observer.DidProcessTask(pending_task);
   if (main_thread_only().blame_context)
     main_thread_only().blame_context->Leave();
 }