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size is defined in `<xutility>` with VS 2019

Bug: none
Change-Id: I337599b8808f36d2c2c3ad1b327352d440c9dea3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879683
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710491}