Remove InitialArrayPrototypeHasInitialArrayPrototypeMap and
HasInitialFastElementsKindMap introduced by
http://crrev.com/55efb6cc5dd0ae28b9cc41da31fe86069487c113,
but not used after
http://crrev.com/1525374ff5a564b55b748ad33e6cd0d0ea684006.

Change-Id: I1182221a95d5fc1ac953139e400533efe420bd19
Reviewed-on: https://chromium-review.googlesource.com/1045951Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53065}