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This will skip the various metadata .ini files that are currently
checked-in upstream (like for infrastructure tests). It will also avoid
exporting any chromium-specific metadata.ini files that we create in the
near future.

Bug: 1116091
Change-Id: I69389cd8410416d9b0e58789edb3bac84a886397
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354517
Commit-Queue: Luke Z <lpz@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798680}