Remove use of attach/detatch cache from distance field text

Change-Id: I09549cb21e8bdbc2924a54bc2eca3d399e5a7f44
Reviewed-on: https://skia-review.googlesource.com/113429
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed