Remove old Authentication code that we don't use or need.

remoting/protocol/content_description.cc

 // Copyright (c) 2011 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/protocol/content_description.h"
 
 #include "base/base64.h"
 #include "base/logging.h"
 #include "base/string_number_conversions.h"
 #include "remoting/base/constants.h"
-#include "remoting/proto/auth.pb.h"
 #include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
 
 using buzz::QName;
 using buzz::XmlElement;
 
 namespace remoting {
 namespace protocol {
 
 const char ContentDescription::kChromotingContentName[] = "chromoting";
 
@@ skipping 298 matching lines @@
     }
 
     return new ContentDescription(config.release(), auth_token, certificate);
   }
   LOG(ERROR) << "Invalid description: " << element->Str();
   return NULL;
 }
 
 }  // namespace protocol
 }  // namespace remoting