Remove old code

This old code contains a TODO to remove the code once this was fixed:
https://bugs.webkit.org/show_bug.cgi?id=73460 (fixed in 2012)

Change-Id: Ide14aae549125407c2b4d4c35b6163f0d211095c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401061


Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Auto-Submit: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805544}