debug_info_test: replace whitelist with allowlist

This CL tweaks language to better reflect the intent that's meant to be
conveyed, per go/chromium-project-code-inclusion .

This change is meant to trivially be a local, functional nop; renaming
extensions will be a later CL.

BUG=chromium:1099035
TEST=CQ+1

Change-Id: Iaee8b96c54660b4ebb4363a230e768c3da3f885a
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2265049
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
4 files changed