Adjust positioning of cros tray bubbles.

ash/common/system/tray/system_tray_item.cc

Index: ash/common/system/tray/system_tray_item.cc
diff --git a/ash/common/system/tray/system_tray_item.cc b/ash/common/system/tray/system_tray_item.cc
index e1e579851dca95457f1de8b0f8d7c172d3e0ff4f..518c1aef22dad24996afbfe1feaf0526587e485c 100644
--- a/ash/common/system/tray/system_tray_item.cc
+++ b/ash/common/system/tray/system_tray_item.cc
@@ -69,10 +69,6 @@ void SystemTrayItem::HideNotificationView() {
   system_tray()->HideNotificationView(this);
 }
 
-bool SystemTrayItem::ShouldHideArrow() const {
-  return false;
-}
-
 bool SystemTrayItem::ShouldShowShelf() const {
   return true;
 }