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This is duplicated to the same config set in build/config/BUILDCONFIG.gn
causing 2 sets of coverage compiler flags in compile command.

Bug: 1137569
Change-Id: Ic4f712ff098e6e8b036576782d5f1a09f693da32
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2463853Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Zhaoyang Li <zhaoyangli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816623}