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When the files-zip-no-nacl flag is enabled, the cros-disks zip handling
is called via mountArchivesInternal_.

Zip integration tests still work: browser_tests --gtest_filter=*zipFile*

Test: Manually tested on DUT
Bug: 912236
Change-Id: I4a5732161f19edd8a10ac5fc4ec280694a1c8415
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2239775Reviewed-by: François Degros <fdegros@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784421}