Reduce FOR_EACH_OBSERVER usage in ui/

ui/events/ozone/device/device_manager_manual.cc

Index: ui/events/ozone/device/device_manager_manual.cc
diff --git a/ui/events/ozone/device/device_manager_manual.cc b/ui/events/ozone/device/device_manager_manual.cc
index 65d1c2533c42d6ae122fbf8ed1700874b9f1a18c..ccd58ce2e43ad90b4ac225bb0a84c6475b88bd43 100644
--- a/ui/events/ozone/device/device_manager_manual.cc
+++ b/ui/events/ozone/device/device_manager_manual.cc
@@ -66,7 +66,8 @@ void DeviceManagerManual::OnDevicesScanned(
   for (; it != result->end(); ++it) {
     devices_.push_back(*it);
     DeviceEvent event(DeviceEvent::INPUT, DeviceEvent::ADD, *it);
-    FOR_EACH_OBSERVER(DeviceEventObserver, observers_, OnDeviceEvent(event));
+    for (auto& observer : observers_)
+      observer.OnDeviceEvent(event);
   }
 }