Remove usage of FOR_EACH_OBSERVER macro in ui/compositor/.

ui/compositor/compositor_vsync_manager.cc

Index: ui/compositor/compositor_vsync_manager.cc
diff --git a/ui/compositor/compositor_vsync_manager.cc b/ui/compositor/compositor_vsync_manager.cc
index f51847ca7bf2cf508c5d7a456bb55ee0e0dd22ba..2bc25fc0275e22fbd3fcb5a4a79d1676f06bf708 100644
--- a/ui/compositor/compositor_vsync_manager.cc
+++ b/ui/compositor/compositor_vsync_manager.cc
@@ -39,8 +39,8 @@ void CompositorVSyncManager::RemoveObserver(Observer* observer) {
 
 void CompositorVSyncManager::NotifyObservers(base::TimeTicks timebase,
                                              base::TimeDelta interval) {
-  FOR_EACH_OBSERVER(CompositorVSyncManager::Observer, observer_list_,
-                    OnUpdateVSyncParameters(timebase, interval));
+  for (auto& observer : observer_list_)
+    observer.OnUpdateVSyncParameters(timebase, interval);
 }
 
 }  // namespace ui