Rewrite std::string("") to std::string(), Linux edition.

jingle/notifier/communicator/single_login_attempt.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 <string>
 
 #include "jingle/notifier/communicator/single_login_attempt.h"
 
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 67 matching lines @@
   }
   redirect_server.set_port(port);
   return redirect_server;
 }
 
 }  // namespace
 
 void SingleLoginAttempt::OnError(buzz::XmppEngine::Error error, int subcode,
                                  const buzz::XmlElement* stream_error) {
   DVLOG(1) << "Error: " << error << ", subcode: " << subcode
-           << (stream_error ?
-               (", stream error: " + XmlElementToString(*stream_error)) :
-               "");
+           << (stream_error
+                   ? (", stream error: " + XmlElementToString(*stream_error))
+                   : std::string());
 
   DCHECK_EQ(error == buzz::XmppEngine::ERROR_STREAM, stream_error != NULL);
 
   // Check for redirection.  We expect something like:
   //
   // <stream:error><see-other-host xmlns="urn:ietf:params:xml:ns:xmpp-streams"/><str:text xmlns:str="urn:ietf:params:xml:ns:xmpp-streams">talk.google.com</str:text></stream:error> [2]
   //
   // There are some differences from the spec [1]:
   //
   //   - we expect a separate text element with the redirection info
@@ skipping 72 matching lines @@
           client_settings.token_service(),
           login_settings_.auth_mechanism());
   xmpp_connection_.reset(
       new XmppConnection(client_settings,
                          login_settings_.request_context_getter(),
                          this,
                          pre_xmpp_auth));
 }
 
 }  // namespace notifier