Rename GrTextUtils::Target to GrTextTarget

Change-Id: I29e1c6e117a4cbbde6e43639228b1103966b6358
Reviewed-on: https://skia-review.googlesource.com/146641
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
15 files changed