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Update buid/check_gn_headers_whitelist.txt

Remove nonexistent header files from the whitelist.

Change-Id: Ibd68cb0ee9d3293da1ef38ed8596bcb5c7669024
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1891195Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712941}