Implement UncheckedMalloc and UncheckedCalloc for platforms that stub out EnableTerminationOnOutOfMemory.
Implement UncheckedMalloc and UncheckedCalloc for platforms that stub out EnableTerminationOnOutOfMemory.

BUG=552017
R=stuartmorgan@chromium.org

Review URL: https://codereview.chromium.org/1418003009

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#358415}

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