Remove usage of std::copy_n from the entry points. This method is c++11 only and caused a build breakage on Mac. BUG=angle:773 Change-Id: Ib362b8d577aa85b9d6d2b8b87840ec5197240cf2 Reviewed-on: https://chromium-review.googlesource.com/241010 Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Jamie Madill <jmadill@chromium.org>