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This change adds logic to show a modal detailing Chromium's
use of location data after First Run and showing the prompt if the
user taps on the primary action button. This is hidden behind the
kLocationFirstRunModal flag.

Bug: 1138603
Change-Id: I5ba49231b547edaeaef1ee025744a344f9135998
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485748
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822029}