Reduce usage of FOR_EACH_OBSERVER macro in components/

components/offline_pages/background/request_coordinator.cc

Index: components/offline_pages/background/request_coordinator.cc
diff --git a/components/offline_pages/background/request_coordinator.cc b/components/offline_pages/background/request_coordinator.cc
index 18731068c8f41f2524cbc4e9328094db1372aaff..c37d7c9b4ab0d9b5a524d2530b2a4caa495fbe55 100644
--- a/components/offline_pages/background/request_coordinator.cc
+++ b/components/offline_pages/background/request_coordinator.cc
@@ -755,16 +755,19 @@ void RequestCoordinator::RemoveObserver(Observer* observer) {
 }
 
 void RequestCoordinator::NotifyAdded(const SavePageRequest& request) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnAdded(request));
+  for (Observer& observer : observers_)
+    observer.OnAdded(request);
 }
 
 void RequestCoordinator::NotifyCompleted(const SavePageRequest& request,
                                          BackgroundSavePageResult status) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnCompleted(request, status));
+  for (Observer& observer : observers_)
+    observer.OnCompleted(request, status);
 }
 
 void RequestCoordinator::NotifyChanged(const SavePageRequest& request) {
-  FOR_EACH_OBSERVER(Observer, observers_, OnChanged(request));
+  for (Observer& observer : observers_)
+    observer.OnChanged(request);
 }
 
 void RequestCoordinator::GetOffliner() {