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Also enable the GFD extension in tests so that all the metadata and type
fields are reported correctly.

Drive-by: test cleanups.

Bug: 1069295
Change-Id: I9ffb5c9874c9f8556785a0664ee010d3912f866a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2207162Reviewed-by: Marina Ciocea <marinaciocea@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771727}