Revert "Update fontconfig cache key handling"

This reverts commit eb686109386934e0ced433a64f1e6704afc613ab.

Reason for revert: Suspecting as the cause for https://ci.chromium.org/p/chromium/builders/ci/linux-archive-rel/29115

Original change's description:
> Update fontconfig cache key handling
>
> Since If6853404f1e87de4f95a24f6231282543814bd63, the "uuid" variable has
> been referring to the MD5 of a fixed string. Update the comment as such,
> and remove the now-unneeded .uuid file writing.
>
> Also update test_fonts/README.chromium as the manual UUID change is no
> longer necessary or effective.
>
> Bug: 767754
> Change-Id: I07a9b10a631e755877cbcb7df40a53359329f8a3
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2209397
> Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
> Auto-Submit: Timothy Gu <timothygu@chromium.org>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#770287}

TBR=thomasanderson@chromium.org,timothygu@chromium.org

Change-Id: I7cc1c702d84a1c1a82933ae104d9d0e7fb4dcf5c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 767754
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208322
Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770346}
NOKEYCHECK=True
GitOrigin-RevId: f6a8516b8074a59c74566f3a57da7ffd534af2f7
1 file changed