replace NULL->nullptr in src/remoting.

remoting/protocol/jingle_session.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 "remoting/protocol/jingle_session.h"
 
 #include "base/bind.h"
 #include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
@@ skipping 53 matching lines @@
       return INCOMPATIBLE_PROTOCOL;
   }
   NOTREACHED();
   return UNKNOWN_ERROR;
 }
 
 }  // namespace
 
 JingleSession::JingleSession(JingleSessionManager* session_manager)
     : session_manager_(session_manager),
-      event_handler_(NULL),
+      event_handler_(nullptr),
       state_(INITIALIZING),
       error_(OK),
       config_is_set_(false),
       weak_factory_(this) {
 }
 
 JingleSession::~JingleSession() {
   channel_multiplexer_.reset();
   STLDeleteContainerPointers(pending_requests_.begin(),
                              pending_requests_.end());
@@ skipping 250 matching lines @@
   // Delete the request from the list of pending requests.
   pending_requests_.erase(request);
   delete request;
 
   // Ignore all responses after session was closed.
   if (state_ == CLOSED || state_ == FAILED)
     return;
 
   std::string type_str = JingleMessage::GetActionName(request_type);
 
-  // |response| will be NULL if the request timed out.
+  // |response| will be nullptr if the request timed out.
   if (!response) {
     LOG(ERROR) << type_str << " request timed out.";
     CloseInternal(SIGNALING_TIMEOUT);
     return;
   } else {
     const std::string& type =
         response->Attr(buzz::QName(std::string(), "type"));
     if (type != "result") {
       LOG(ERROR) << "Received error in response to " << type_str
                  << " message: \"" << response->Str()
@@ skipping 317 matching lines @@
   }
 }
 
 bool JingleSession::is_session_active() {
   return state_ == CONNECTING || state_ == ACCEPTING || state_ == CONNECTED ||
         state_ == AUTHENTICATING || state_ == AUTHENTICATED;
 }
 
 }  // namespace protocol
 }  // namespace remoting