Added support for multiple parameters to Extension API callbacks.

chrome/browser/extensions/system/system_api.cc

 // 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.
 
 #include "chrome/browser/extensions/system/system_api.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_event_router.h"
 #include "chrome/browser/prefs/pref_service.h"
@@ skipping 55 matching lines @@
 }  // namespace
 
 namespace extensions {
 
 bool GetIncognitoModeAvailabilityFunction::RunImpl() {
   PrefService* prefs = profile_->GetPrefs();
   int value = prefs->GetInteger(prefs::kIncognitoModeAvailability);
   EXTENSION_FUNCTION_VALIDATE(
       value >= 0 &&
       value < static_cast<int>(arraysize(kIncognitoModeAvailabilityStrings)));
-  result_.reset(
+  SetSingleResult(
       Value::CreateStringValue(kIncognitoModeAvailabilityStrings[value]));
   return true;
 }
 
 bool GetUpdateStatusFunction::RunImpl() {
   std::string state;
   double download_progress = 0;
 #if defined(OS_CHROMEOS)
   // With UpdateEngineClient, we can provide more detailed information about
   // system updates on ChromeOS.
@@ skipping 40 matching lines @@
   if (UpgradeDetector::GetInstance()->notify_upgrade()) {
     state = kNeedRestartState;
     download_progress = 1;
   } else {
     state = kNotAvailableState;
   }
 #endif
   DictionaryValue* dict = new DictionaryValue();
   dict->SetString(kStateKey, state);
   dict->SetDouble(kDownloadProgressKey, download_progress);
-  result_.reset(dict);
+  SetSingleResult(dict);
 
   return true;
 }
 
 void DispatchVolumeChangedEvent(double volume, bool is_volume_muted) {
   ListValue args;
   DictionaryValue* dict = new DictionaryValue();
   dict->SetDouble(kVolumeKey, volume);
   dict->SetBoolean(kIsVolumeMutedKey, is_volume_muted);
   args.Append(dict);
@@ skipping 13 matching lines @@
   ListValue args;
   DispatchEvent(kOnScreenUnlocked, args);
 }
 
 void DispatchWokeUpEvent() {
   ListValue args;
   DispatchEvent(kOnWokeUp, args);
 }
 
 }  // namespace extensions