Revert "Reland "Let client pass in full extension to GrVkBackendContext.""

This reverts commit a782dcb3c407a7e30d7c1263bf9965792088e786.

Reason for revert: fuchsia changes reverted

Original change's description:
> Reland "Let client pass in full extension to GrVkBackendContext."
> 
> This reverts commit cb92b26e5ca6063bcf1a922109b8224e0b6eb4da.
> 
> Reason for revert: <INSERT REASONING HERE>
> 
> Original change's description:
> > Revert "Let client pass in full extension to GrVkBackendContext."
> > 
> > This reverts commit 45c9dab4c3ec43cedb28d1b8c08e166fe0c2e767.
> > 
> > Reason for revert: fucshia uses GrVkBackendContext. Need to revert earlier changes
> > 
> > Original change's description:
> > > Let client pass in full extension to GrVkBackendContext.
> > > 
> > > Bug: skia:
> > > Change-Id: I772ab4ccbca0f4f7e7d429d6c421b07d97f0606f
> > > Reviewed-on: https://skia-review.googlesource.com/131880
> > > Reviewed-by: Jim Van Verth <jvanverth@google.com>
> > > Commit-Queue: Greg Daniel <egdaniel@google.com>
> > 
> > TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com
> > 
> > Change-Id: I1a765ff406c83cb234c3614b804fbed677d5a382
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: skia:
> > Reviewed-on: https://skia-review.googlesource.com/137901
> > Reviewed-by: Greg Daniel <egdaniel@google.com>
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
> 
> TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: skia:
> Change-Id: I0af797c51dde705473e9afaccb1d4b4423e8c41e
> Reviewed-on: https://skia-review.googlesource.com/138302
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>

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

Change-Id: Idf760d5ac6b82df33a4408079a0223be833058ad
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/138420
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
13 files changed