Remove unused code resulted from deleting DeferredTextureImage

Bug: skia:
Change-Id: Iaedc09880bd6a2d8fda4ce52f1644a944dd72605
Reviewed-on: https://skia-review.googlesource.com/106266
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
9 files changed