This reverts commit 9349c143
and commit d43b0574.

It's no longer needed after we bind attribute locations before link.

Original CL message:

This will allow the capture/replay tool to easily intercept and label
attribute locations for remapping.

There's some inconsistency in implementation in the GL desktop front-
end. This is a quick fix and the full implementation is left for when
we implement the full desktop GL API set.

Bug: angleproject:4598
Change-Id: Ic510159d4d1982eff41560503cabf983a1be0381
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2174076Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>