tests: remove uses of variable length arrays

VLAs are generally discouraged, to the point where Clang now warns about
them by default. Since these already have obvious upper-bounds present
and enforced, leverage those.

BUG=b:316021385
TEST=FEATURES=test emerge-brya gestures

Change-Id: Iaf3d7ac0198e8ad5894f56fcdf4bcfea3bb45c80
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/gestures/+/5754535
Tested-by: George Burgess <gbiv@chromium.org>
Code-Coverage: Zoss <zoss-cl-coverage@prod.google.com>
Reviewed-by: Kenneth Albanowski <kenalba@google.com>
Commit-Queue: George Burgess <gbiv@chromium.org>
2 files changed