Remove ListValue::Append(new {Fundamental,String}Value(...)) pattern in //extensions

extensions/browser/event_router.cc

Index: extensions/browser/event_router.cc
diff --git a/extensions/browser/event_router.cc b/extensions/browser/event_router.cc
index 6cc2c7b647bcaeaa1a362a853d5b99fbd1ea5496..a2a6505e28515d413c3fcac9ad7d7100d4d1f9dd 100644
--- a/extensions/browser/event_router.cc
+++ b/extensions/browser/event_router.cc
@@ -406,7 +406,7 @@ void EventRouter::SetRegisteredEvents(const std::string& extension_id,
   ListValue* events_value = new ListValue;
   for (std::set<std::string>::const_iterator iter = events.begin();
        iter != events.end(); ++iter) {
-    events_value->Append(new base::StringValue(*iter));
+    events_value->AppendString(*iter);
   }
   extension_prefs_->UpdateExtensionPref(
       extension_id, kRegisteredEvents, events_value);