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Arraysize was being used for destination array sizes in memcpy and
memcmp, which returns the number of elements rather than the number of
bytes, as these functions expect. The result is that the entire arrays
were not getting copied.

BUG=469151

Review URL: https://codereview.chromium.org/1028673002

Cr-Commit-Position: refs/heads/master@{#321587}