Remove GoogleNowNotification stats collector

chrome/browser/notifications/message_center_notification_manager.cc

Index: chrome/browser/notifications/message_center_notification_manager.cc
diff --git a/chrome/browser/notifications/message_center_notification_manager.cc b/chrome/browser/notifications/message_center_notification_manager.cc
index 49028114e94e7f66872001c72f23d17f1fc19dd7..e60cdd6f8c11a0a9b8e80ab4bde751eb77425501 100644
--- a/chrome/browser/notifications/message_center_notification_manager.cc
+++ b/chrome/browser/notifications/message_center_notification_manager.cc
@@ -46,8 +46,7 @@ MessageCenterNotificationManager::MessageCenterNotificationManager(
     : message_center_(message_center),
       settings_provider_(std::move(settings_provider)),
       system_observer_(this),
-      stats_collector_(message_center),
-      google_now_stats_collector_(message_center) {
+      stats_collector_(message_center) {
   message_center_->AddObserver(this);
   message_center_->SetNotifierSettingsProvider(settings_provider_.get());