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If input file contains non-utf-8 characters, running
GetResourceAllowlistFileList in python3 fails with a variation of:
"UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 24: invalid start byte"

This change makes python3 treat data as bytes, while leaving
python2 behavior unchanged.

Change-Id: Idb6f4cf8fe3a98551df91b1249a1b74ba2916acc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2560505Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831015}