remove textblobbuilder guard

Bug: skia:
Change-Id: Ie686a8dcedf26a0f7c10f29befded7978a92daca
Reviewed-on: https://skia-review.googlesource.com/c/173230
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Mike Reed <reed@google.com>
1 file changed