Added new GCD/Privet interfaces.

chrome/browser/local_discovery/privet_http.cc

Index: chrome/browser/local_discovery/privet_http.cc
diff --git a/chrome/browser/local_discovery/privet_http.cc b/chrome/browser/local_discovery/privet_http.cc
index 59d1811176be9c1632a972148a0b15efb114d97d..a2c5cb294bc0dd7a54f6a3e351ce8d432152e46e 100644
--- a/chrome/browser/local_discovery/privet_http.cc
+++ b/chrome/browser/local_discovery/privet_http.cc
@@ -11,8 +11,19 @@ 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