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The CL also removes unnecessary mb_config.pyl.

Bug: b/137246264
Change-Id: Ib241089a5c6c1a0c67e5effe6ef9efb1f7d30db3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1732095Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686699}