glbench: Replace deprecated scoped_array<T> with scoped_ptr<T[]>

BUG=chromium:338610
TEST=emerge-{x86,amd64,arm}-generic autotest-tests

Change-Id: I5bed0a426993c2b6b34336bfdfc042c6fd375e2f
Reviewed-on: https://chromium-review.googlesource.com/184058
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Tested-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Ben Chan <benchan@chromium.org>
4 files changed