Version 4.4.24.1 (cherry-pick)

Merged 88e2d14c

Initialize idle old generation allocation limit in constructor.

BUG=478082
LOG=N
TBR=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1057413006

Cr-Commit-Position: refs/heads/4.4.24@{#2}
Cr-Branched-From: e3c2ba77-refs/heads/master@{#27904}