[cleanup] Delete empty simdjs folder.

I have no idea how the empty folder got
in there in the first place ¯\_(ツ)_/¯.

Bug:

Change-Id: I0fd94d1dec76f2444b24f772c1691924f872ec55
Reviewed-on: https://chromium-review.googlesource.com/485621Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44803}

data @ baf49398

-Subproject commit baf493985cb9ea7cdbd0d68704860a8156de9556