MD Settings: Use FireWebUIListener() helper wherever possible.

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

Index: chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.cc
diff --git a/chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.cc b/chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.cc
index 7b36f47cd03c40019b23158a59ee4f147d780c1e..061dad6d18206e90d17b4a5e99448ad6c42311c3 100644
--- a/chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.cc
+++ b/chrome/browser/ui/webui/settings/chromeos/device_pointer_handler.cc
@@ -36,14 +36,11 @@ void PointerHandler::OnJavascriptDisallowed() {
 }
 
 void PointerHandler::TouchpadExists(bool exists) {
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("has-touchpad-changed"),
-                         base::Value(exists));
+  FireWebUIListener("has-touchpad-changed", base::Value(exists));
 }
 
 void PointerHandler::MouseExists(bool exists) {
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("has-mouse-changed"), base::Value(exists));
+  FireWebUIListener("has-mouse-changed", base::Value(exists));
 }
 
 void PointerHandler::HandleInitialize(const base::ListValue* args) {