Use std::move() instead of .Pass() in remoting/host

remoting/host/heartbeat_sender.cc

Index: remoting/host/heartbeat_sender.cc
diff --git a/remoting/host/heartbeat_sender.cc b/remoting/host/heartbeat_sender.cc
index 5e4e00bb0a289304d6c022576ddfa5bf720dc7bc..93b773691ab0769cabab86ee5fc0d50bfe42c534 100644
--- a/remoting/host/heartbeat_sender.cc
+++ b/remoting/host/heartbeat_sender.cc
@@ -341,7 +341,7 @@ scoped_ptr<XmlElement> HeartbeatSender::CreateHeartbeatMessage() {
   AddHostFieldsToLogEntry(log_entry.get());
   log->AddElement(log_entry->ToStanza().release());
   heartbeat->AddElement(log.release());
-  return heartbeat.Pass();
+  return heartbeat;
 }
 
 scoped_ptr<XmlElement> HeartbeatSender::CreateSignature() {
@@ -353,7 +353,7 @@ scoped_ptr<XmlElement> HeartbeatSender::CreateSignature() {
   std::string signature(host_key_pair_->SignMessage(message));
   signature_tag->AddText(signature);
 
-  return signature_tag.Pass();
+  return signature_tag;
 }
 
 }  // namespace remoting