Rewrite scoped_ptr<T>(NULL) to use the default ctor in chrome/.

chrome/browser/automation/automation_event_queue.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 <algorithm>
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "chrome/browser/automation/automation_event_observers.h"
 #include "chrome/browser/automation/automation_event_queue.h"
 #include "chrome/browser/automation/automation_provider_json.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 
 AutomationEventQueue::CompareObserverId::CompareObserverId(int id) : id_(id) {}
 
 bool AutomationEventQueue::CompareObserverId::operator()(
     AutomationEvent* event) const {
   return event->GetId() < 0 || event->GetId() == id_;
 }
 
 AutomationEventQueue::AutomationEventQueue()
-    : observer_id_count_(0),
-      wait_automation_reply_(NULL),
-      wait_observer_id_(-1) {}
+    : observer_id_count_(0), wait_observer_id_(-1) {}
 
 AutomationEventQueue::~AutomationEventQueue() {
   Clear();
 }
 
 AutomationEventQueue::AutomationEvent::AutomationEvent(
     int observer_id, DictionaryValue* event_value)
     : observer_id_(observer_id), event_value_(event_value) {}
 
 void AutomationEventQueue::GetNextEvent(AutomationJSONReply* reply,
@@ skipping 79 matching lines @@
     if (event) {
       wait_automation_reply_->SendSuccess(event->GetValue());
       wait_automation_reply_.reset();
       wait_observer_id_ = -1;
       delete event;
       return true;
     }
   }
   return false;
 }