Revert "Change refPinnedTextureProxy to return a view instead."

This reverts commit becd2fe91d1aa374670c28bbbd84d7ef39bb859e.

Reason for revert: crashing in pre-abandon

Original change's description:
> Change refPinnedTextureProxy to return a view instead.
> 
> Bug: skia:9556
> Change-Id: Iad3fbadb893d029fc39f0b682c9f8fc223c010a5
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268843
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

TBR=egdaniel@google.com,brianosman@google.com

Change-Id: I496e4d9f7fc43e990b3e1ae2b2d2a461deeadb8f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:9556
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/268940
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
8 files changed