replace NULL->nullptr in src/remoting.

remoting/signaling/iq_sender_unittest.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 "base/bind.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "remoting/signaling/iq_sender.h"
@@ skipping 95 matching lines @@
   base::RunLoop().RunUntilIdle();
 }
 
 TEST_F(IqSenderTest, Timeout) {
   ASSERT_NO_FATAL_FAILURE({
     SendTestMessage();
   });
 
   request_->SetTimeout(base::TimeDelta::FromMilliseconds(2));
 
-  EXPECT_CALL(callback_, OnReply(request_.get(), NULL))
+  EXPECT_CALL(callback_, OnReply(request_.get(), nullptr))
       .WillOnce(InvokeWithoutArgs(&message_loop_, &base::MessageLoop::Quit));
   message_loop_.Run();
 }
 
 TEST_F(IqSenderTest, InvalidFrom) {
   ASSERT_NO_FATAL_FAILURE({
     SendTestMessage();
   });
 
   scoped_ptr<XmlElement> response(new XmlElement(buzz::QN_IQ));
   response->AddAttr(QName(std::string(), "type"), "result");
   response->AddAttr(QName(std::string(), "id"), kStanzaId);
   response->AddAttr(QName(std::string(), "from"), "different_user@domain.com");
 
   XmlElement* result = new XmlElement(
       QName("test:namespace", "response-body"));
   response->AddElement(result);
 
   EXPECT_CALL(callback_, OnReply(_, _))
       .Times(0);
   EXPECT_FALSE(sender_->OnSignalStrategyIncomingStanza(response.get()));
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace remoting