SkImage_Lazy::lockTextureProxyView computes its own key

Remove unused key from GrYUVAImageTextureMaker.

Remove outdated comment about width/height for image/bitmap key.

Change-Id: I76efd61725a0c63c058cdf480295f49dcfeab0fb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274238
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
5 files changed