CHROMIUM: delete desktop/mime cache QA check

Portage likes to constantly update mime caches even when a package
doesn't touch the dir.  If the cache is up-to-date, it's fast.  But
when we install a lot of binpkgs into a new root, we hit a window
where the initial mime files are installed, and then a lot of other
binpkgs finish and check the caches which don't exist, and then we
spawn a lot of update-mime-database calls in parallel, and wait for
them all to finish.

These QA checks are here only to workaround packages that fail to
update the caches themselves.  We have very very packages that use
these dirs (only 1 for mime cache), and they all correctly call the
corresponding eclasses to update their caches, so these add nothing.
Punt it all to stop wasting build time on them.

BUG=None
TEST=CQ passes

Change-Id: I640c7b2f8f80beba44e1c4474407476c44ea795e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/portage_tool/+/3628652
Tested-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Sloan Johnson <sloanjohnson@google.com>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sloan Johnson <sloanjohnson@google.com>
3 files changed