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This addition to LayoutRectOutsets is only used for inline layout,
but brings an unnecessary dependency geometry -> text.
Moving utility closer to the usage makes reasoning about deps easier.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_layout_ng
Change-Id: Ib29fe76da950b1e1316a0d9573fca0b2c93c1c84
Reviewed-on: https://chromium-review.googlesource.com/1062664Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560340}