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On Windows, malloc() (in Chrome) never returns nullptr, instead triggering an
OOM. Explicitly using UncheckedMalloc() to get nullptr in case of allocation
failure.

Bug: 905777
Change-Id: I56bf677710b606cc6ca69073f4cc2d34c4ef19dd
Reviewed-on: https://chromium-review.googlesource.com/c/1344064Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Benoit L <lizeb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609991}