Replace FOR_EACH_OBSERVER in c/b/ui/app_list with range-based for

chrome/browser/ui/app_list/app_list_syncable_service.cc

Index: chrome/browser/ui/app_list/app_list_syncable_service.cc
diff --git a/chrome/browser/ui/app_list/app_list_syncable_service.cc b/chrome/browser/ui/app_list/app_list_syncable_service.cc
index e0fe309bb42a3171141c5f4ca501a23cd320bf54..b6b654289f736dbc73d40a17559de2539d991a5c 100644
--- a/chrome/browser/ui/app_list/app_list_syncable_service.cc
+++ b/chrome/browser/ui/app_list/app_list_syncable_service.cc
@@ -327,7 +327,8 @@ void AppListSyncableService::RemoveObserver(Observer* observer) {
 }
 
 void AppListSyncableService::NotifyObserversSyncUpdated() {
-  FOR_EACH_OBSERVER(Observer, observer_list_, OnSyncModelUpdated());
+  for (auto& observer : observer_list_)
+    observer.OnSyncModelUpdated();
 }
 
 size_t AppListSyncableService::GetNumSyncItemsForTest() {