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Allocation padding was added to the global port map to avoid
being stomped on by a UAF somewhere on Chrome for Android.

The culprit has likely been found and a fix is imminent. See
bug 673417 for details.

BUG=740044,725605
TBR=jcivelli@chromium.org

Change-Id: I934c0e7a6a84a7eb21a74d122f446e14275babbf
Reviewed-on: https://chromium-review.googlesource.com/688492Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505051}