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This simplifies some memory management works.

Bug: 773503
Change-Id: I00ddaab4f2e6709115741cdf796acda1021fd24d
Reviewed-on: https://chromium-review.googlesource.com/777973Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517911}