Test if clang warns on valid code.

chrome/browser/notifications/notification_ui_manager_mac.mm

Index: chrome/browser/notifications/notification_ui_manager_mac.mm
diff --git a/chrome/browser/notifications/notification_ui_manager_mac.mm b/chrome/browser/notifications/notification_ui_manager_mac.mm
index ba74927e01f26963e541abb28ceca7f8035e0a15..cb9f4db8ff43f330437915db799c80d866f5d36b 100644
--- a/chrome/browser/notifications/notification_ui_manager_mac.mm
+++ b/chrome/browser/notifications/notification_ui_manager_mac.mm
@@ -99,9 +99,9 @@ NotificationUIManager* NotificationUIManager::Create(
 }
 
 NotificationUIManagerMac::ControllerNotification::ControllerNotification(
-    id<CrUserNotification> a_view, Notification* a_model)
-    : view(a_view),
-      model(a_model) {
+    id<CrUserNotification> view, Notification* model)
+    : view(view),
+      model(model) {
 }
 
 NotificationUIManagerMac::ControllerNotification::~ControllerNotification() {