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This is necessary for Pinpoint, which still uses these isolates.
This is a fix after https://chromium-review.googlesource.com/c/chromium/src/+/2003767 landed.
See the bug for details.

TBR=bsheedy@chromium.org

Bug: 1042778
Change-Id: Iff81712f2e3f6d26171064922056361e9fc7b4e7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2006391Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732746}