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crrev.com/c/2401512 suggested using sizeof(variable) ISO sizeof(type)
for various reasons [1]. This CL follows up by cleaning a previously
landed similar idiom.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/2401512/comment/8675d0dc_90c8dccc/

Bug: b/166646505
Change-Id: I86f21fd4e12f8c1b4402ec2520391f138a402f5a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2403680
Auto-Submit: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#805818}