MD Settings: Use FireWebUIListener() helper wherever possible.

chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc

Index: chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc
diff --git a/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc b/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc
index fe90000b6233f1dd6891adbd1a16c4e0051f5495..28a1781f5cad216bd1123cd274008f7d44ca2c0e 100644
--- a/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc
+++ b/chrome/browser/ui/webui/settings/chromeos/cups_printers_handler.cc
@@ -289,9 +289,7 @@ void CupsPrintersHandler::OnAddedPrinter(
 }
 
 void CupsPrintersHandler::OnAddPrinterError() {
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("on-add-cups-printer"), base::Value(false),
-                         base::Value(""));
+  FireWebUIListener("on-add-cups-printer", base::Value(false), base::Value(""));
 }
 
 void CupsPrintersHandler::HandleGetCupsPrinterManufacturers(
@@ -409,13 +407,11 @@ void CupsPrintersHandler::OnPrintersFound(
     printers_list->Append(GetPrinterInfo(printer));
   }
 
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("on-printer-discovered"), *printers_list);
+  FireWebUIListener("on-printer-discovered", *printers_list);
 }
 
 void CupsPrintersHandler::OnDiscoveryInitialScanDone() {
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("on-printer-discovery-done"));
+  FireWebUIListener("on-printer-discovery-done");
 }
 
 }  // namespace settings