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

remoting/host/heartbeat_sender.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/host/heartbeat_sender.h"
 
 #include <math.h>
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 323 matching lines @@
         QName(kChromotingXmlNamespace, kHostOperatingSystemVersionTag)));
     os_version_tag->AddText(GetHostOperatingSystemVersion());
     heartbeat->AddElement(os_version_tag.release());
   }
   // Append log message (which isn't signed).
   scoped_ptr<XmlElement> log(ServerLogEntry::MakeStanza());
   scoped_ptr<ServerLogEntry> log_entry(MakeLogEntryForHeartbeat());
   AddHostFieldsToLogEntry(log_entry.get());
   log->AddElement(log_entry->ToStanza().release());
   heartbeat->AddElement(log.release());
-  return heartbeat.Pass();
+  return heartbeat;
 }
 
 scoped_ptr<XmlElement> HeartbeatSender::CreateSignature() {
   scoped_ptr<XmlElement> signature_tag(new XmlElement(
       QName(kChromotingXmlNamespace, kHeartbeatSignatureTag)));
 
   std::string message = NormalizeJid(signal_strategy_->GetLocalJid()) + ' ' +
                         base::IntToString(sequence_id_);
   std::string signature(host_key_pair_->SignMessage(message));
   signature_tag->AddText(signature);
 
-  return signature_tag.Pass();
+  return signature_tag;
 }
 
 }  // namespace remoting