Make TokenValidatorFactory ref-counted.

remoting/protocol/token_validator.h

 // Copyright 2014 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_TOKEN_VALIDATOR_H_
 #define REMOTING_PROTOCOL_TOKEN_VALIDATOR_H_
 
 #include <string>
 
 #include "base/callback.h"
+#include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "url/gurl.h"
 
 namespace remoting {
 
 class RsaKeyPair;
 
 namespace protocol {
 
 // The |TokenValidator| encapsulates the parameters to be sent to the client
@@ skipping 20 matching lines @@
 
   // URL sent to the client, to be used by its |TokenFetcher| to get a token.
   virtual const GURL& token_url() const = 0;
 
   // Space-separated list of connection attributes the host must send to the
   // client, and require the token received in response to match.
   virtual const std::string& token_scope() const = 0;
 };
 
 // Factory for |TokenValidator|.
-class TokenValidatorFactory {
+class TokenValidatorFactory
+    : public base::RefCountedThreadSafe<TokenValidatorFactory> {
  public:
-  virtual ~TokenValidatorFactory() {}
-
   // Creates a TokenValidator. |local_jid| and |remote_jid| are used to create
   // a token scope that is restricted to the current connection's JIDs.
   virtual scoped_ptr<TokenValidator> CreateTokenValidator(
       const std::string& local_jid,
       const std::string& remote_jid) = 0;
+
+ protected:
+  friend class base::RefCountedThreadSafe<TokenValidatorFactory>;
+
+  virtual ~TokenValidatorFactory() {}
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_TOKEN_VALIDATOR_H_