If there are multiple users of translator.dll then one could ShFinalize
and destroy the memory of all the others.  libANGLE needs it's own copies
of the global pool allocator to make sure this doesn't happen.

There should be no functional changes for non-component builds.

BUG=angle:823

Change-Id: Id6f7d50e86d8950834399b16a7ab14e6e3198d12
Reviewed-on: https://chromium-review.googlesource.com/234594Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>