Revert "Add private GrContext::compile API"

This reverts commit 0cd68ab14a08f83de8580296fb83795225dfd7c7.

Reason for revert: unimplement pure virtual

Original change's description:
> Add private GrContext::compile API
> 
> Currently this is only implemented for GL.
> 
> Bug: skia:9455
> Change-Id: I8f369273b697e80a4bade5dd2283e66df688f0ec
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/271742
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

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

Change-Id: If273a3328cfff759e213e9be02eb63c3725ea0f8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:9455
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/272342
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
13 files changed