Reduce usage of FOR_EACH_OBSERVER macro in components/

components/variations/service/variations_service.cc

Index: components/variations/service/variations_service.cc
diff --git a/components/variations/service/variations_service.cc b/components/variations/service/variations_service.cc
index 8f5d5df8efa9dd05531706b0d24c1e4728aca493..6b95b26f6e63d91c85a0c0a52095e7a96b12adb4 100644
--- a/components/variations/service/variations_service.cc
+++ b/components/variations/service/variations_service.cc
@@ -626,11 +626,11 @@ void VariationsService::NotifyObservers(
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (result.kill_critical_group_change_count > 0) {
-    FOR_EACH_OBSERVER(Observer, observer_list_,
-                      OnExperimentChangesDetected(Observer::CRITICAL));
+    for (auto& observer : observer_list_)
+      observer.OnExperimentChangesDetected(Observer::CRITICAL);
   } else if (result.kill_best_effort_group_change_count > 0) {
-    FOR_EACH_OBSERVER(Observer, observer_list_,
-                      OnExperimentChangesDetected(Observer::BEST_EFFORT));
+    for (auto& observer : observer_list_)
+      observer.OnExperimentChangesDetected(Observer::BEST_EFFORT);
   }
 }