Delete promise image texture caching code

Bug: skia:11369
Change-Id: I44e316de76231cf1451cd61a24b53c6d74eea15d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/375201
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed