Revert 121055 - Remove BeginSessionDeprecated.

remoting/proto/control.proto

Index: remoting/proto/control.proto
===================================================================
--- remoting/proto/control.proto	(revision 121259)
+++ remoting/proto/control.proto	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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.
 //
@@ -10,3 +10,14 @@
 
 package remoting.protocol;
 
+// BeginSessionDeprecated is sent from host to client when the session
+// starts. Legacy clients expect to receive this message at the
+// beginning of each session. Current clients ignore it.
+//
+// TODO(sergeyu): Remove this message. See http://crbug.com/104670 .
+message LocalLoginStatusDeprecated {
+  optional bool success = 1;
+}
+message BeginSessionDeprecated {
+  optional LocalLoginStatusDeprecated login_status = 1;
+}