Removes unused parameter from CommitBlock and CommitMemory functions.

Change-Id: I4b79c1802060f1f70e06fd39532758fcdae2bead
Reviewed-on: https://chromium-review.googlesource.com/1039830Reviewed-by: Hannes Payer <hpayer@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52936}