Allow input & clipboard filters to be disabled without NULLing target stub.

remoting/host/client_session.h

Index: remoting/host/client_session.h
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index 39b2273d1ffa84e5629b4f18a725f3183f783890..bad5273f6945d99bc1d73fc2f829624f01a21363 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -114,7 +114,7 @@ class ClientSession : public protocol::ClipboardStub,
 
   const std::string& client_jid() { return client_jid_; }
 
-  bool is_authenticated() { return is_authenticated_;  }
+  bool is_authenticated() { return auth_input_filter_.enabled();  }
 
   // Indicate that local mouse activity has been detected. This causes remote
   // inputs to be ignored for a short time so that the local user will always
@@ -135,7 +135,6 @@ class ClientSession : public protocol::ClipboardStub,
   scoped_ptr<protocol::ConnectionToClient> connection_;
 
   std::string client_jid_;
-  bool is_authenticated_;
 
   // The host clipboard and input stubs to which this object delegates.
   // These are the final elements in the clipboard & input pipelines, which