Remove -fmodule-map-file from chromium, since GN now generates it

Link: https://chromium-review.googlesource.com/id/I4d2be8bf83b899a675d295e95eaaa1c96a6a6964
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7790592
Auto-Submit: Matt Stark <msta@google.com>
Commit-Queue: Matt Stark <msta@google.com>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1619937}
NOKEYCHECK=True
GitOrigin-RevId: ab28b66d331375832eb0b06473dba463d3640a8e