Let NotificationTypeToRealModelType() handle APP_SETTINGS correctly.

chrome/browser/sync/syncable/model_type.cc

Index: chrome/browser/sync/syncable/model_type.cc
diff --git a/chrome/browser/sync/syncable/model_type.cc b/chrome/browser/sync/syncable/model_type.cc
index ccce16902e180eec84b949f16d884e6cf3dadcb4..7029a161ba3bf5d39fff952fe394416e503a0390 100644
--- a/chrome/browser/sync/syncable/model_type.cc
+++ b/chrome/browser/sync/syncable/model_type.cc
@@ -639,15 +639,17 @@ bool NotificationTypeToRealModelType(const std::string& notification_type,
     return true;
   } else if (notification_type == kAppSettingNotificationType) {
     *model_type = APP_SETTINGS;
+    return true;
   } else if (notification_type == kExtensionSettingNotificationType) {
     *model_type = EXTENSION_SETTINGS;
     return true;
   } else if (notification_type == kAppNotificationNotificationType) {
     *model_type = APP_NOTIFICATIONS;
     return true;
+  } else {
+    *model_type = UNSPECIFIED;
+    return false;
   }
-  *model_type = UNSPECIFIED;
-  return false;
 }
 
 ModelTypeSet GetAllRealModelTypes() {