replace NULL->nullptr in src/remoting.

remoting/protocol/jingle_messages_unittest.cc

Index: remoting/protocol/jingle_messages_unittest.cc
diff --git a/remoting/protocol/jingle_messages_unittest.cc b/remoting/protocol/jingle_messages_unittest.cc
index 26a22d1751df10d6a0841e1887b10b065cf58ffe..de58443e32d0d73d2863753494724d20b31863df 100644
--- a/remoting/protocol/jingle_messages_unittest.cc
+++ b/remoting/protocol/jingle_messages_unittest.cc
@@ -41,7 +41,7 @@ bool VerifyXml(const XmlElement* exp,
     return false;
   }
 
-  for (const XmlAttr* exp_attr = exp->FirstAttr(); exp_attr != NULL;
+  for (const XmlAttr* exp_attr = exp->FirstAttr(); exp_attr != nullptr;
        exp_attr = exp_attr->NextAttr()) {
     if (exp_attr->Name().Namespace() == kXmlNsNs ||
         exp_attr->Name() == QName(kXmlNs)) {
@@ -256,7 +256,7 @@ TEST(JingleMessageTest, SessionInfo) {
   EXPECT_TRUE(message.ParseXml(source_message.get(), &error)) << error;
 
   EXPECT_EQ(message.action, JingleMessage::SESSION_INFO);
-  ASSERT_TRUE(message.info.get() != NULL);
+  ASSERT_TRUE(message.info.get() != nullptr);
   EXPECT_TRUE(message.info->Name() ==
               buzz::QName("urn:xmpp:jingle:1", "test-info"));