Make V8ValueConverter.FromV8Value behave similarly to JSON.stringify

chrome/renderer/resources/extensions/schema_generated_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.
 
 // This script contains privileged chrome extension related javascript APIs.
 // It is loaded by pages whose URL has the chrome-extension protocol.
 
   // TODO(battre): cleanup the usage of packages everywhere, as described here
   // http://codereview.chromium.org/10392008/diff/38/chrome/renderer/resources/extensions/schema_generated_bindings.js
 
@@ skipping 293 matching lines @@
               args = this.updateArgumentsPreValidate.apply(this, args);
 
             args = schemaUtils.normalizeArgumentsAndValidate(args, this);
             if (this.updateArgumentsPostValidate)
               args = this.updateArgumentsPostValidate.apply(this, args);
 
             var retval;
             if (this.handleRequest) {
               retval = this.handleRequest.apply(this, args);
             } else {
+              var optArgs = {
+                customCallback: this.customCallback
+              };
               retval = sendRequest(this.name, args,
                                    this.definition.parameters,
-                                   {customCallback: this.customCallback});
+                                   optArgs);
             }
 
             // Validate return value if defined - only in debug.
             if (chromeHidden.validateCallbacks &&
                 this.definition.returns) {
               schemaUtils.validate([retval], [this.definition.returns]);
             }
             return retval;
           }).bind(apiFunction);
         });
@@ skipping 111 matching lines @@
     // beginInstallWithManifest2.
     // See http://crbug.com/100242
     if (chrome.webstorePrivate) {
       chrome.webstorePrivate.beginInstallWithManifest2 =
           chrome.webstorePrivate.beginInstallWithManifest3;
     }
 
     if (chrome.test)
       chrome.test.getApiDefinitions = GetExtensionAPIDefinition;
   });