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in order to make the wpt_internal directory exist on the bot so
that the manifest can be written into it.

Bug: 1018829
Change-Id: I1c15caf5abd37c50839587f7713d7636d56a5cd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1884812
Commit-Queue: Luke Z <lpz@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710002}