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ui/ozone/ozone.gni was moved to build/config/ozone.gni, however, it
turns out that ozone.gni depends on ozone_extra.gni, so this CL moves
ui/ozone/ozone_extra.gni to build/config/ozone_extra.gni in order to
keep build/config self-contained.

Bug: 1129223
Change-Id: I0b67cbd41d7b402dfd595204a3a599053c83ba77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451872
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#814305}