Remove unused string placeholder.

TBR=ivankr@chromium.org
BUG=141559

Review URL: https://chromiumcodereview.appspot.com/10836200

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151167 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/ui/webui/chromeos/login/update_screen_handler.cc

@@ -44,8 +44,7 @@ void UpdateScreenHandler::GetLocalizedStrings(
   localized_strings->SetString("checkingForUpdates",
       l10n_util::GetStringUTF16(IDS_CHECKING_FOR_UPDATES));
   localized_strings->SetString("installingUpdateDesc",
-      l10n_util::GetStringFUTF16(IDS_UPDATE_MSG,
-                                 short_product_name, short_product_name));
+      l10n_util::GetStringFUTF16(IDS_UPDATE_MSG, short_product_name));
   localized_strings->SetString("downloadingTimeLeftLong",
       l10n_util::GetStringUTF16(IDS_DOWNLOADING_TIME_LEFT_LONG));
   localized_strings->SetString("downloadingTimeLeftStatusOneHour",