Revert "Don't zip shell APK before uploading to Google Storage."
Revert "Don't zip shell APK before uploading to Google Storage."

This reverts commit 5a0c079dce9b90fc4aca8f352254fdbbed4e8391.

This CL misdiagnosed the problem on Android; the actual problem was the one
fixed in https://codereview.chromium.org/905463002.

R=qsr@chromium.org

Review URL: https://codereview.chromium.org/906513002

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