Fix a typo in webview_custom_bindings.js

chrome/renderer/resources/extensions/webview_custom_bindings.js

Index: chrome/renderer/resources/extensions/webview_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/webview_custom_bindings.js b/chrome/renderer/resources/extensions/webview_custom_bindings.js
index 3eb96cd34353bfa6e07e2826d1ffac233b8e3596..6d98a71f577d0592f4f369e69bb7f512390ea00c 100644
--- a/chrome/renderer/resources/extensions/webview_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/webview_custom_bindings.js
@@ -99,7 +99,8 @@ binding.registerCustomHook(function(bindingsAPI) {
     var instanceId = request.args[0];
     var id = request.args[1];
     if (request.args[2].onclick) {
-      contextMenus.handlersForId(instanceId, id)[id] = request.args[2].onclick;
+      webviewContextMenus.handlersForId(instanceId, id)[id] =
+          request.args[2].onclick;
     }
   });