Remove legacy texture-backed promise image interface.

No longer used by Chrome.

Change-Id: I842482490f132bb3aa3e85f847d8d4167f5595df
Reviewed-on: https://skia-review.googlesource.com/c/188029
Commit-Queue: Robert Phillips <robertphillips@google.com>
Auto-Submit: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
3 files changed