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Labels are not assigned to targets anymore, so the definition is now meaningless.
Instead, target affinity is defined.
This should allow us to finally close tracking bug.

Bug: 760614
Change-Id: Id705837bd502ae0e6333b9fc8cab250bc590ff11
Reviewed-on: https://chromium-review.googlesource.com/1119388
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573461}