Reduce usage of FOR_EACH_OBSERVER macro in components/

components/prefs/default_pref_store.cc

Index: components/prefs/default_pref_store.cc
diff --git a/components/prefs/default_pref_store.cc b/components/prefs/default_pref_store.cc
index ed401899c871a1bd11e7289979183261e60e6029..468c11c74835a56871d48f40167c486ad4a5cd5b 100644
--- a/components/prefs/default_pref_store.cc
+++ b/components/prefs/default_pref_store.cc
@@ -41,8 +41,10 @@ void DefaultPrefStore::ReplaceDefaultValue(const std::string& key,
   GetValue(key, &old_value);
   bool notify = !old_value->Equals(value.get());
   prefs_.SetValue(key, std::move(value));
-  if (notify)
-    FOR_EACH_OBSERVER(Observer, observers_, OnPrefValueChanged(key));
+  if (notify) {
+    for (Observer& observer : observers_)
+      observer.OnPrefValueChanged(key);
+  }
 }
 
 DefaultPrefStore::const_iterator DefaultPrefStore::begin() const {