Remove ref to obsolete input-tools-nacl pkg in ebuild_sizing.

"input-tools-nacl" ebuild package no longer exists.
It was removed @ https://crrev.com/i/8521337.

BUG=b:170278753
TEST=None

Change-Id: I784bd7db2d15d5d07a9850274680a984b17274ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/6865731
Auto-Submit: Bao-Duy Tran <tranbaoduy@chromium.org>
Reviewed-by: Matt Stark <msta@google.com>
Commit-Queue: Ryo Hashimoto <hashimoto@chromium.org>
Tested-by: Bao-Duy Tran <tranbaoduy@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>