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Only provision an AdTracker to a local frame if AdTagging is
enabled. Useful to measure the performance impact of the AdTracker.
AdTagging feature declaration moved to support RuntimeEnabledFeature

Bug: 856273
Change-Id: I898c78d5be916583744b445afad885d445b440bf
Reviewed-on: https://chromium-review.googlesource.com/1115374Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: John Delaney <johnidel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576493}