Remove unused ctor in GrTextureDomain

Change-Id: I82b4add39f87133157f94745902df0b3a1a23680
Reviewed-on: https://skia-review.googlesource.com/22063
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed