Remove abandon param from GrGpu::deleteTestingOnlyBackendTexture.

Prior to the existence of GrBackendTexture this was required to delete a backend-specific blob. Now it's a no-op.

Change-Id: Iba0e4233e4d07235626f0ae14b0f7e77c073d8c0
Reviewed-on: https://skia-review.googlesource.com/112569
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
10 files changed