With this CL we do the redirection of ExternalReferences for simulators
independent of the isolate but instead use the redirector provided by
the simulator directly. Thereby we make the code independent of the
isolate.

I plan to remove the redirector from the isolate in a separate CL.

R=mstarzinger@chromium.org

Change-Id: I2ae0b2184da214cf7606fabeabc9bec35bf0616e
Reviewed-on: https://chromium-review.googlesource.com/1012039Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52648}