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Prior to this CL removal of grit output file in BUILD.gn wasn't
triggering a re-run of grit if all other files are up-to-date. This may
cause a suprising output list verification failure later, during clean
build.

R=agrieve@chromium.org

Change-Id: I881992c174d5d3a2433759e2622929c4e84b3845
Reviewed-on: https://chromium-review.googlesource.com/c/1310274Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604620}