2 Brewfile dependencies failed to install

[takatoshiono]

1passのためにdropboxはまずさいしょにいれるし、chromeは（会社PCの場合は）最初から入っているのだった。放置でもいいんだけど、記録だけ

==> Satisfying dependencies
==> Downloading https://www.dropbox.com/download?plat=mac&full=1
==> Downloading from https://clientupdates.dropboxstatic.com/dbx-releng/client/Dropbox%2056.4.94.dmg
==> No checksum defined for Cask dropbox, skipping verification
==> Installing Cask dropbox
Error: It seems there is already an App at '/Applications/Dropbox.app'.
==> Purging files for version latest of Cask dropbox
Installing dropbox has failed!

==> Satisfying dependencies
==> Downloading https://dl.google.com/chrome/mac/stable/GGRO/googlechrome.dmg
==> Verifying checksum for Cask google-chrome
==> Installing Cask google-chrome
Error: It seems there is already an App at '/Applications/Google Chrome.app'.
==> Purging files for version 68.0.3440.106 of Cask google-chrome
Installing google-chrome has failed!