Make element removal methods in DictionaryValue and ListValue take scoped_ptr's as outparams.

chrome/browser/extensions/event_router.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/event_router.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 125 matching lines @@
   ipc_sender->Send(new ExtensionMsg_MessageInvoke(
       MSG_ROUTING_CONTROL,
       extension_id,
       "event_bindings",
       "dispatchEvent",
       args,
       user_gesture == USER_GESTURE_ENABLED));
 
   // DispatchExtensionMessage does _not_ take ownership of event_args, so we
   // must ensure that the destruction of args does not attempt to free it.
-  Value* removed_event_args = NULL;
+  scoped_ptr<Value> removed_event_args;
   args.Remove(1, &removed_event_args);
+  ignore_result(removed_event_args.release());
 }
 
 // static
 void EventRouter::DispatchEvent(IPC::Sender* ipc_sender,
                                 void* profile_id,
                                 const std::string& extension_id,
                                 const std::string& event_name,
                                 scoped_ptr<ListValue> event_args,
                                 UserGestureState user_gesture,
                                 const EventFilteringInfo& info) {
@@ skipping 702 matching lines @@
   copy->will_dispatch_callback = will_dispatch_callback;
   return copy;
 }
 
 EventListenerInfo::EventListenerInfo(const std::string& event_name,
                                      const std::string& extension_id)
     : event_name(event_name),
       extension_id(extension_id) {}
 
 }  // namespace extensions