This reverts commit ca086a49.

Reason for revert: Seems to be the cause for https://bugs.chromium.org/p/chromium/issues/detail?id=908296

Original change's description:
> [parser] Perfect hash for keywords
> 
> Use gperf to generate a perfect hash table for keyword lookup. Adds a
> python script which munges the output of gperf and adds additional
> cleanup and optimisations.
> 
> Change-Id: I3656a7287dbd0688917893de3a671faef9e4578a
> Reviewed-on: https://chromium-review.googlesource.com/c/1349240
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Reviewed-by: Marja Hölttä <marja@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#57790}

TBR=marja@chromium.org,leszeks@chromium.org,verwaest@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: Ia0cc283f21e9f6793522c46a1fd40ba2d88597fb
Reviewed-on: https://chromium-review.googlesource.com/c/1350113Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57811}