Make miscellaneous_bindings and event_bindings Required as needed. Previously

chrome/renderer/resources/extensions/test_custom_bindings.js

Index: chrome/renderer/resources/extensions/test_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/test_custom_bindings.js b/chrome/renderer/resources/extensions/test_custom_bindings.js
index 9a52f8a491b4b8175592e3c036be08cf6f438bc6..774f134b19dd32c535f157da2613975567891061 100644
--- a/chrome/renderer/resources/extensions/test_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/test_custom_bindings.js
@@ -12,6 +12,7 @@ var GetExtensionAPIDefinitions =
     requireNative('apiDefinitions').GetExtensionAPIDefinitions;
 var GetAvailability = requireNative('v8_context').GetAvailability;
 var GetAPIFeatures = requireNative('test_features').GetAPIFeatures;
+var Event = require('event_bindings').Event;
 var json = require('json');
 
 binding.registerCustomHook(function(api) {
@@ -295,6 +296,10 @@ binding.registerCustomHook(function(api) {
   apiFunctions.setHandleRequest('getApiFeatures', function() {
     return GetAPIFeatures();
   });
+
+  apiFunctions.setHandleRequest('createEvent', function(name) {
+    return new Event(name);
+  });
 });
 
 exports.binding = binding.generate();