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The warning is benign (warn about an empty block protected by an if)
but cause Xcode 12.0+ to consider the build as a failure (as soon as
the output contains the string "error", Xcode consider the build as
a failure).

Silence the warning until the dependency can be rolled (currently
blocked by the fact that mirroring from github is misconfigured).

Bug: 1129390, 1129393
Change-Id: I170de8cac0fa88612bac157737f7abd2fbfa4989
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416273
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807904}