Update dromeo to upstream a876d5250befbc41e2deab9d10cf6085b511d5ed

This cl is to update the folder with the newest version following instructions in https://cs.chromium.org/chromium/src/chrome/test/data/dromaeo/README.chromium
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2499923002
Cr-Commit-Position: refs/heads/master@{#436773}
51 files changed