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This is a leftover review from crrev.com/c/1677161. It ensures we always include the current
manifest file for WPT.

Bug: 937369
Change-Id: I2200cb5644d1518129e577f8612d1e83a4a79c16
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1706640
Auto-Submit: Luke Z <lpz@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678373}