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This CL adds support for file manager browser tests that have the
enhanced format dialog flag enabled.

Bug: 632988
Change-Id: I57d02530b8304487d5ff76c7a5538f379f86adb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1662987Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670365}