Skip unknown channel configurations when parsing session config.

remoting/protocol/content_description.h

 // 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.
 
 #ifndef REMOTING_PROTOCOL_CONTENT_DESCRIPTION_H_
 #define REMOTING_PROTOCOL_CONTENT_DESCRIPTION_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 26 matching lines @@
   const CandidateSessionConfig* config() const {
     return candidate_config_.get();
   }
 
   const buzz::XmlElement* authenticator_message() const {
     return authenticator_message_.get();
   }
 
   buzz::XmlElement* ToXml() const;
 
-  static ContentDescription* ParseXml(const buzz::XmlElement* element);
+  static scoped_ptr<ContentDescription> ParseXml(
+      const buzz::XmlElement* element);
 
  private:
   scoped_ptr<const CandidateSessionConfig> candidate_config_;
   scoped_ptr<const buzz::XmlElement> authenticator_message_;
 
   static bool ParseChannelConfigs(const buzz::XmlElement* const element,
                                   const char tag_name[],
                                   bool codec_required,
                                   bool optional,
                                   std::vector<ChannelConfig>* const configs);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CONTENT_DESCRIPTION_H_