replace NULL->nullptr in src/remoting.

remoting/host/setup/daemon_controller.h

Index: remoting/host/setup/daemon_controller.h
diff --git a/remoting/host/setup/daemon_controller.h b/remoting/host/setup/daemon_controller.h
index f757f787d2bf10273717c783ebc1526fcff21b94..522a840266890c8e309aab5e1b3f14e8cbe1e2a2 100644
--- a/remoting/host/setup/daemon_controller.h
+++ b/remoting/host/setup/daemon_controller.h
@@ -74,7 +74,7 @@ class DaemonController : public base::RefCountedThreadSafe<DaemonController> {
   // Callback type for GetConfig(). If the host is configured then a dictionary
   // is returned containing host_id and xmpp_login, with security-sensitive
   // fields filtered out. An empty dictionary is returned if the host is not
-  // configured, and NULL if the configuration is corrupt or cannot be read.
+  // configured, and nullptr if the configuration is corrupt or cannot be read.
   typedef base::Callback<void (scoped_ptr<base::DictionaryValue> config)>
       GetConfigCallback;