Merge "Remove unused constants for encrypted OBBs" am: 77984639

import static android.os.storage.OnObbStateChangeListener.ERROR_ALREADY_MOUNTED;

import static android.os.storage.OnObbStateChangeListener.ERROR_COULD_NOT_MOUNT;

import static android.os.storage.OnObbStateChangeListener.ERROR_COULD_NOT_UNMOUNT;

import static android.os.storage.OnObbStateChangeListener.ERROR_INTERNAL;

import static android.os.storage.OnObbStateChangeListener.ERROR_NOT_MOUNTED;

import static android.os.storage.OnObbStateChangeListener.ERROR_PERMISSION_DENIED;

import static android.os.storage.OnObbStateChangeListener.MOUNTED;

    private final Callbacks mCallbacks;

    private final LockPatternUtils mLockPatternUtils;

    /**

     * The size of the crypto algorithm key in bits for OBB files. Currently

     * Twofish is used which takes 128-bit keys.

     */

    private static final int CRYPTO_ALGORITHM_KEY_SIZE = 128;

    /**

     * The number of times to run SHA1 in the PBKDF2 function for OBB files.

     * 1024 is reasonably secure and not too slow.

     */

    private static final int PBKDF2_HASH_ROUNDS = 1024;

    private static final String ANR_DELAY_MILLIS_DEVICE_CONFIG_KEY =

            "anr_delay_millis";