Revert "Use saveLayer-determined CT in SkGpuDevice::onCreateDevice"

This reverts commit 16559a1f9fee8f117fa0d30b64643707ff017fa1.

Reason for revert: ANGLE images look bad

Original change's description:
> Use saveLayer-determined CT in SkGpuDevice::onCreateDevice
> 
> Currently Ganesh always uses the prev render target CT, but saveLayer
> may force a different CT, depending on flags.
> 
> This fixes handling of saveLayer/kF16ColorType (added in
> https://skia-review.googlesource.com/c/skia/+/227066).
> 
> Change-Id: Iab476c4afa4c70e25c452b2c430cbded5adb25e9
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/241876
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Florin Malita <fmalita@chromium.org>
> Commit-Queue: Brian Osman <brianosman@google.com>

TBR=bsalomon@google.com,brianosman@google.com,fmalita@chromium.org

Change-Id: I1e8eafbfdd7391c18eda4942cbdf0046a4ee2b53
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/243039
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed