Make OwnerKeyUtil thread safe as originally intended.

chrome/browser/chromeos/settings/owner_key_util.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 CHROME_BROWSER_CHROMEOS_SETTINGS_OWNER_KEY_UTIL_H_
 #define CHROME_BROWSER_CHROMEOS_SETTINGS_OWNER_KEY_UTIL_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 
 class FilePath;
 
 namespace crypto {
 class RSAPrivateKey;
 }
 
 namespace chromeos {
 
 class OwnerKeyUtilTest;
 
-class OwnerKeyUtil : public base::RefCounted<OwnerKeyUtil> {
+class OwnerKeyUtil : public base::RefCountedThreadSafe<OwnerKeyUtil> {
  public:
   // Creates an OwnerKeyUtil instance.
   static OwnerKeyUtil* Create();
 
   // Attempts to read the public key from the file system.
   // Upon success, returns true and populates |output|.  False on failure.
   virtual bool ImportPublicKey(std::vector<uint8>* output) = 0;
 
   // Looks for the private key associated with |key| in the default slot,
   // and returns it if it can be found.  Returns NULL otherwise.
   // Caller takes ownership.
   virtual crypto::RSAPrivateKey* FindPrivateKey(
       const std::vector<uint8>& key) = 0;
 
   // Checks whether the public key is present in the file system.
   virtual bool IsPublicKeyPresent() = 0;
 
  protected:
   OwnerKeyUtil();
   virtual ~OwnerKeyUtil();
 
  private:
-  friend class base::RefCounted<OwnerKeyUtil>;
+  friend class base::RefCountedThreadSafe<OwnerKeyUtil>;
 
   FRIEND_TEST_ALL_PREFIXES(OwnerKeyUtilTest, ExportImportPublicKey);
 };
 
 // Implementation of OwnerKeyUtil that is used in production code.
 class OwnerKeyUtilImpl : public OwnerKeyUtil {
  public:
   // The file outside the owner's encrypted home directory where her
   // key will live.
   static const char kOwnerKeyFile[];
@@ skipping 12 matching lines @@
  private:
   // The file that holds the public key.
   FilePath key_file_;
 
   DISALLOW_COPY_AND_ASSIGN(OwnerKeyUtilImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_OWNER_KEY_UTIL_H_