Added new GCD/Privet interfaces.

chrome/browser/local_discovery/privet_http.cc

 // Copyright 2014 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 "chrome/browser/local_discovery/privet_http.h"
 
 #include "chrome/browser/local_discovery/privet_http_impl.h"
 
 namespace local_discovery {
 
 // static
 scoped_ptr<PrivetV1HTTPClient> PrivetV1HTTPClient::CreateDefault(
     scoped_ptr<PrivetHTTPClient> info_client) {
+  if (!info_client)
+    return scoped_ptr<PrivetV1HTTPClient>();
   return make_scoped_ptr<PrivetV1HTTPClient>(
       new PrivetV1HTTPClientImpl(info_client.Pass())).Pass();
 }
 
+// static
+scoped_ptr<PrivetV3HTTPClient> PrivetV3HTTPClient::CreateDefault(
+    scoped_ptr<PrivetHTTPClient> info_client) {
+  if (!info_client)
+    return scoped_ptr<PrivetV3HTTPClient>();
+  return make_scoped_ptr<PrivetV3HTTPClient>(
+             new PrivetV3HTTPClientImpl(info_client.Pass())).Pass();
+}
+
 }  // namespace local_discovery