Reduce usage of FOR_EACH_OBSERVER macro in components/

components/physical_web/data_source/physical_web_data_source_impl.cc

Index: components/physical_web/data_source/physical_web_data_source_impl.cc
diff --git a/components/physical_web/data_source/physical_web_data_source_impl.cc b/components/physical_web/data_source/physical_web_data_source_impl.cc
index 744afcc60d2fe5608d9371ec617d0096d60c6e84..600a2b5e61c069949ca6e1827df3935e71ab3324 100644
--- a/components/physical_web/data_source/physical_web_data_source_impl.cc
+++ b/components/physical_web/data_source/physical_web_data_source_impl.cc
@@ -22,16 +22,18 @@ void PhysicalWebDataSourceImpl::UnregisterListener(
 }
 
 void PhysicalWebDataSourceImpl::NotifyOnFound(const std::string& url) {
-  FOR_EACH_OBSERVER(PhysicalWebListener, observer_list_, OnFound(url));
+  for (PhysicalWebListener& observer : observer_list_)
+    observer.OnFound(url);
 }
 
 void PhysicalWebDataSourceImpl::NotifyOnLost(const std::string& url) {
-  FOR_EACH_OBSERVER(PhysicalWebListener, observer_list_, OnLost(url));
+  for (PhysicalWebListener& observer : observer_list_)
+    observer.OnLost(url);
 }
 
 void PhysicalWebDataSourceImpl::NotifyOnDistanceChanged(
     const std::string& url,
     double distance_estimate) {
-  FOR_EACH_OBSERVER(PhysicalWebListener, observer_list_,
-                    OnDistanceChanged(url, distance_estimate));
+  for (PhysicalWebListener& observer : observer_list_)
+    observer.OnDistanceChanged(url, distance_estimate);
 }