Ensure that data doesn't leak between users on cros chrome crash.

chrome/browser/chromeos/cros/cryptohome_library.h

 // Copyright (c) 2010 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_CROS_CRYPTOHOME_LIBRARY_H_
 #define CHROME_BROWSER_CHROMEOS_CROS_CRYPTOHOME_LIBRARY_H_
 
 #include <string>
 
 #include "base/singleton.h"
@@ skipping 13 matching lines @@
   // Asks cryptohomed to try to find the cryptohome for |user_email| and then
   // mount it using |passhash| to unlock the key.
   virtual bool Mount(const std::string& user_email,
                      const std::string& passhash);
 
   // Asks cryptohomed to try to find the cryptohome for |user_email| and then
   // use |passhash| to unlock the key.
   virtual bool CheckKey(const std::string& user_email,
                         const std::string& passhash);
 
+  // Asks cryptohomed if a drive is currently mounted.
+  virtual bool IsMounted();
+
  private:
   friend struct DefaultSingletonTraits<CryptohomeLibrary>;
   friend class MockCryptohomeLibrary;
 
   CryptohomeLibrary() {}
   ~CryptohomeLibrary() {}
 
   DISALLOW_COPY_AND_ASSIGN(CryptohomeLibrary);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROS_CRYPTOHOME_LIBRARY_H_