Version 4.2.77.15 (cherry-pick)

Merged 1b16678f

Properly handle non-JSFunction constructors in CanRetainOtherContext

R=jkummerow@chromium.org
BUG=chromium:470128

Review URL: https://codereview.chromium.org/1077623002

Cr-Commit-Position: refs/branch-heads/4.2@{#18}
Cr-Branched-From: 3dfd929e-refs/heads/4.2.77@{#2}
Cr-Branched-From: e0110920-refs/heads/master@{#26757}