Bumping metadata database version to 11.

    // used to identify the versions for upgrades. This should never change going forward.

    private static final int METADATA_DATABASE_VERSION_WITH_CLIENTID = 6;

    // The current database version.

    private static final int CURRENT_METADATA_DATABASE_VERSION = 10;

    // This MUST be increased every time the dictionary pack metadata URL changes.

    private static final int CURRENT_METADATA_DATABASE_VERSION = 11;

    private final static long NOT_A_DOWNLOAD_ID = -1;