Move the class declaration for SpeciesCreateByLength to a header file
so that we can share more TypedArray CSA code.

Delete the C++ implementation of species create for typed arrays
because it is no longer used.

Change-Id: I7c43b8ef144ba9a8ce12516f7cb8fb570491cb26
Reviewed-on: https://chromium-review.googlesource.com/904987Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Peter Marshall <petermarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#51139}