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`gn gen` failed due to missing pdb files.

This is follwup of
https://chromium-review.googlesource.com/c/1279380

TBR: wfh@chromium.org thestig@chromium.org
Change-Id: I513d10d61a3868953c4afc025adf840e0f3c70c2
Reviewed-on: https://chromium-review.googlesource.com/c/1286108
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600636}