Update dropbox-beta from 99.3.488 to 99.3.490 (#9148)
Update dropbox-beta from 99.3.488 to 99.3.490 (#9148)


pkq/homebrew-versions,mahori/homebrew-cask-versions,caskroom/homebrew-versions,rogeriopradoj/homebrew-versions,rogeriopradoj/homebrew-versions,404NetworkError/homebrew-versions,pkq/homebrew-versions,caskroom/homebrew-versions,404NetworkError/homebrew-versions