setupInjectedScriptEnvironment should check array getters/setters as well.

R=dgozman@chromium.org

Bug: none
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I72b03f62980e339d83bcfda55f1d35135b23da3b
Reviewed-on: https://chromium-review.googlesource.com/636469Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47623}