Adjust positioning of cros tray bubbles.

ash/common/system/chromeos/brightness/tray_brightness.cc

Index: ash/common/system/chromeos/brightness/tray_brightness.cc
diff --git a/ash/common/system/chromeos/brightness/tray_brightness.cc b/ash/common/system/chromeos/brightness/tray_brightness.cc
index d90cb2eb08b4b69e58a54b091fde3ba3bc0620c2..7e7117f7fc06e13b6cd13709378b859e75cb882e 100644
--- a/ash/common/system/chromeos/brightness/tray_brightness.cc
+++ b/ash/common/system/chromeos/brightness/tray_brightness.cc
@@ -247,10 +247,6 @@ void TrayBrightness::DestroyDetailedView() {
 
 void TrayBrightness::UpdateAfterLoginStatusChange(LoginStatus status) {}
 
-bool TrayBrightness::ShouldHideArrow() const {
-  return true;
-}
-
 bool TrayBrightness::ShouldShowShelf() const {
   return false;
 }