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Also fixes ability to run commands on apks not through wrapper scripts
(must have broken a while ago).

Tested with:
build/android/apk_operations.py print-certs --apk-path AndroidWebview.apk --full-cert

Bug: 1065270
Change-Id: I7aa047fd3570c46c1fde4f6f9e8de1895f10bae3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135335
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756339}