Remove key exchange code from JingleSession.

remoting/protocol/jingle_session.h

Index: remoting/protocol/jingle_session.h
diff --git a/remoting/protocol/jingle_session.h b/remoting/protocol/jingle_session.h
index e4e3a6f1d37f18f3470a72fe580087b2e5ff6133..2336d5faf4ed116db8b5b0fb07f4a2156bb8ce36 100644
--- a/remoting/protocol/jingle_session.h
+++ b/remoting/protocol/jingle_session.h
@@ -80,7 +80,6 @@ class JingleSession : public protocol::Session,
   void set_candidate_config(const CandidateSessionConfig* candidate_config);
   const std::string& local_certificate() const;
   void Init(cricket::Session* cricket_session);
-  std::string GetEncryptedMasterKey() const;
 
   // Close all the channels and terminate the session.
   void CloseInternal(int result, bool failed);
@@ -146,11 +145,6 @@ class JingleSession : public protocol::Session,
   // Public key of the peer.
   std::string peer_public_key_;
 
-  // Master key used to derive ice keys for each ice
-  // session. Generated on the client and sent to the host in the
-  // session-initiate message (encrypted with the host's key).
-  std::string master_key_;
-
   // Shared secret to use in channel authentication.  This is currently only
   // used in IT2Me.
   std::string shared_secret_;