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As far as I can tell, the actual header is no longer used anywhere.
This completes decoupling the flapper targets from the build tree,
so they are removed.

Bug: 1064651
Change-Id: I18996e13c3dbf9df097b3b964e2b0d2113cfef1b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613324Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Anthony LaForge <laforge@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841111}