[Sync] Use ExtractIntegerValue to extract request_id from js args

ios/chrome/browser/ui/webui/sync_internals/sync_internals_message_handler.cc

 // Copyright 2015 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.
 
 #include "ios/chrome/browser/ui/webui/sync_internals/sync_internals_message_handler.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/values.h"
@@ skipping 120 matching lines @@
   web_ui()->CallJavascriptFunction(
       syncer::sync_ui_util::kDispatchEvent,
       base::StringValue(syncer::sync_ui_util::kOnReceivedListOfTypes),
       event_details);
 }
 
 void SyncInternalsMessageHandler::HandleGetAllNodes(
     const base::ListValue* args) {
   DCHECK_EQ(1U, args->GetSize());
   int request_id = 0;
-  bool success = args->GetInteger(0, &request_id);
+  bool success = ExtractIntegerValue(args, &request_id);
   DCHECK(success);
 
   syncer::SyncService* service = GetSyncService();
   if (service) {
     service->GetAllNodes(
         base::Bind(&SyncInternalsMessageHandler::OnReceivedAllNodes,
                    weak_ptr_factory_.GetWeakPtr(), request_id));
   }
 }
 
@@ skipping 71 matching lines @@
       base::StringValue(syncer::sync_ui_util::kOnAboutInfoUpdated), *value);
 }
 
 // Gets the SyncService of the underlying original profile. May return null.
 syncer::SyncService* SyncInternalsMessageHandler::GetSyncService() {
   ios::ChromeBrowserState* browser_state =
       ios::ChromeBrowserState::FromWebUIIOS(web_ui());
   return IOSChromeProfileSyncServiceFactory::GetForBrowserState(
       browser_state->GetOriginalChromeBrowserState());
 }