Rename BitSetIterator.h to bitset_utils.h BUG=angleproject:1814 Change-Id: I152ae13b6b7cf0ba72259967f0f124e199b20e07 Reviewed-on: https://chromium-review.googlesource.com/471826 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>