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This was only used in one test and is covered by an observer interface
method.
This cleans up a dependency from profile.cc on //c/b target towards
moving profile into its own target.

Bug: 268984,1149277
Change-Id: Ic12380f8175214da5ce6920172252178e3268126
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550158
Commit-Queue: Glen Robertson <glenrob@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Auto-Submit: Glen Robertson <glenrob@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830073}