More pre-MD cleanup

ash/common/system/tray/default_system_tray_delegate.cc

Index: ash/common/system/tray/default_system_tray_delegate.cc
diff --git a/ash/common/system/tray/default_system_tray_delegate.cc b/ash/common/system/tray/default_system_tray_delegate.cc
index cfd33501288e66c5982087ac3cae913b3a4f2e7e..140a3887aef1b64872614f3e7cc2d3eb543ae0ac 100644
--- a/ash/common/system/tray/default_system_tray_delegate.cc
+++ b/ash/common/system/tray/default_system_tray_delegate.cc
@@ -34,9 +34,4 @@ bool DefaultSystemTrayDelegate::ShouldShowNotificationTray() const {
   return true;
 }
 
-int DefaultSystemTrayDelegate::GetSystemTrayMenuWidth() {
-  // This is the default width for English languages.
-  return 300;
-}
-
 }  // namespace ash