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

remoting/host/pairing_registry_delegate_linux.cc

 // Copyright 2013 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/pairing_registry_delegate_linux.h"
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_util.h"
 #include "base/files/important_file_writer.h"
@@ skipping 42 matching lines @@
         deserializer.Deserialize(&error_code, &error_message);
     if (!pairing_json) {
       LOG(WARNING) << "Failed to load '" << pairing_file.value() << "' ("
                    << error_code << ").";
       continue;
     }
 
     pairings->Append(pairing_json.release());
   }
 
-  return pairings.Pass();
+  return pairings;
 }
 
 bool PairingRegistryDelegateLinux::DeleteAll() {
   // Delete all pairing files in the pairing registry.
   base::FilePath registry_path = GetRegistryPath();
   base::FileEnumerator enumerator(registry_path, false,
                                   base::FileEnumerator::FILES,
                                   kPairingFilenamePattern);
 
   bool success = true;
@@ skipping 80 matching lines @@
     const base::FilePath& registry_path) {
   registry_path_for_testing_ = registry_path;
 }
 
 
 scoped_ptr<PairingRegistry::Delegate> CreatePairingRegistryDelegate() {
   return make_scoped_ptr(new PairingRegistryDelegateLinux());
 }
 
 }  // namespace remoting