Revert "Use OpenGL sampler objects when available."

This reverts commit 0f7e55a818f4661309871f2db2fe2c2196135bda.

Reason for revert: Chrome roll, even alone (https://chromium-review.googlesource.com/c/chromium/src/+/1290785), maybe Android roll too?

Original change's description:
> Use OpenGL sampler objects when available.
> 
> Bug: skia:8471
> Change-Id: Ida3d08aa72772b8bbd08707048182bee5d27407c
> Reviewed-on: https://skia-review.googlesource.com/c/163123
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

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

Change-Id: Ieee6823e83b9992a7281806b5a9156cd91fb22b9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8471
Reviewed-on: https://skia-review.googlesource.com/c/163780
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
7 files changed