Issues with instance wrapper allocation and JS Api errata have been fixed over the last few weeks, test in the bug no longer fails - enabling tests for imported memory.

BUG=5683

R=bradnelson@chromium.org, ahaas@chromium.org

Review-Url: https://codereview.chromium.org/2666763002
Cr-Commit-Position: refs/heads/master@{#42795}