WebUI: Add helper FireWebUIListener method on WebUIMessageHandler.

chrome/browser/ui/webui/settings/search_engines_handler.cc

Index: chrome/browser/ui/webui/settings/search_engines_handler.cc
diff --git a/chrome/browser/ui/webui/settings/search_engines_handler.cc b/chrome/browser/ui/webui/settings/search_engines_handler.cc
index 077d940d7905736a8c5daf8dca586a1fc57e4e94..dc485a731bf8a70c78de8f2bab8c610eb90d8dc0 100644
--- a/chrome/browser/ui/webui/settings/search_engines_handler.cc
+++ b/chrome/browser/ui/webui/settings/search_engines_handler.cc
@@ -196,13 +196,11 @@ SearchEnginesHandler::GetSearchEnginesList() {
 
 void SearchEnginesHandler::OnModelChanged() {
   AllowJavascript();
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("search-engines-changed"),
-                         *GetSearchEnginesList());
+  FireWebUIListener("search-engines-changed", *GetSearchEnginesList());
+
   // Google Now availability may have changed.
-  CallJavascriptFunction("cr.webUIListenerCallback",
-                         base::Value("google-now-availability-changed"),
-                         base::Value(IsGoogleNowAvailable(profile_)));
+  FireWebUIListener("google-now-availability-changed",
+                    base::Value(IsGoogleNowAvailable(profile_)));
 }
 
 void SearchEnginesHandler::OnItemsChanged(int start, int length) {
@@ -517,8 +515,7 @@ void SearchEnginesHandler::HotwordInfoComplete(
   if (callback_id) {
     ResolveJavascriptCallback(*callback_id, status);
   } else {
-    CallJavascriptFunction("cr.webUIListenerCallback",
-                           base::Value("hotword-info-update"), status);
+    FireWebUIListener("hotword-info-update", status);
   }

[Dan Beam, 2017/05/18 00:08:44]

no curlies

[dpapad, 2017/05/18 00:41:32]

Done.

 }