[Extensions] Remove unnecessary check in app_custom_bindings.js

chrome/renderer/resources/extensions/app_custom_bindings.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Custom binding for the app API.
 
-var GetAvailability = requireNative('v8_context').GetAvailability;
-if (!GetAvailability('app').is_available) {
-  exports.$set('binding', {});
-  exports.$set('onInstallStateResponse', function(){});
-  return;
-}
-
 var appNatives = requireNative('app');
 var process = requireNative('process');
 var extensionId = process.GetExtensionId();
 var logActivity = requireNative('activityLogger');
 
 function wrapForLogging(fun) {
   if (!extensionId)
     return fun;  // nothing interesting to log without an extension
 
   return function() {
@@ skipping 41 matching lines @@
 app.installState = function getInstallState(callback) {
   var callbackId = nextCallbackId++;
   callbacks[callbackId] = callback;
   appNatives.GetInstallState(callbackId);
 };
 if (extensionId)
   app.installState = wrapForLogging(app.installState);
 
 exports.$set('binding', app);
 exports.$set('onInstallStateResponse', onInstallStateResponse);