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When changing GN arg "use_signing_keys", rebuilding would not result in
a resigned apk.

Change fixes this by removing use of md5_check. Using md5_check is
generally only advantageous when one or more inputs are from outside
of the out/ directory, and thus can change when checkout out different
branches. Inputs to apkbuilder.py are entirely from within the out/
directory (except for the script itself, which doesn't change much).

Change-Id: Ic93d559cc2fffb2fabe8af7152038be76f1e71c0
Reviewed-on: https://chromium-review.googlesource.com/c/1435677Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#626134}