Run clang-modernize -use-nullptr over src/extensions/.

extensions/browser/api/sockets_udp/udp_socket_event_dispatcher.cc

 // Copyright 2014 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 "extensions/browser/api/sockets_udp/udp_socket_event_dispatcher.h"
 
 #include "base/lazy_instance.h"
 #include "extensions/browser/api/socket/udp_socket.h"
 #include "extensions/browser/event_router.h"
 #include "extensions/browser/extensions_browser_client.h"
@@ skipping 59 matching lines @@
 
   StartReceive(params);
 }
 
 /* static */
 void UDPSocketEventDispatcher::StartReceive(const ReceiveParams& params) {
   DCHECK_CURRENTLY_ON(params.thread_id);
 
   ResumableUDPSocket* socket =
       params.sockets->Get(params.extension_id, params.socket_id);
-  if (socket == NULL) {
+  if (socket == nullptr) {
     // This can happen if the socket is closed while our callback is active.
     return;
   }
   DCHECK(params.extension_id == socket->owner_extension_id())
       << "Socket has wrong owner.";
 
   // Don't start another read if the socket has been paused.
   if (socket->paused())
     return;
 
@@ skipping 83 matching lines @@
       reinterpret_cast<content::BrowserContext*>(browser_context_id);
   if (!extensions::ExtensionsBrowserClient::Get()->IsValidContext(context))
     return;
   EventRouter* router = EventRouter::Get(context);
   if (router)
     router->DispatchEventToExtension(extension_id, event.Pass());
 }
 
 }  // namespace core_api
 }  // namespace extensions