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This change removes the //mojo copy of zip.py
and updates mojom.gni to use the one from //build/android

Bug: 582594
Change-Id: I8e739c112696c47ce3afb68baf61b139359c5e98
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119636
Commit-Queue: Emily Andrews <emiled@microsoft.com>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753492}