Fix unix file permissions in resource zips and jar files
Fix unix file permissions in resource zips and jar files

https://codereview.chromium.org/1319623002 changed how zip files are
created in the python helper and (accidentally?) made it set 000 unix file
permissions for the archived files. Make it 644 so the zip files are not
suprising to work with on Linux if anyone needs to look at them manually.

BUG=523420
R=dpranke@chromium.org, agrieve@chromium.org,

Review URL: https://codereview.chromium.org/1384513002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#351843}

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