Revert "Make RGB_888x pixel operations work."

This reverts commit 8ce24b1d11f25a871fa23285cfd29373aa5d1d6a.

Reason for revert: https://ci.chromium.org/raw/build/logs.chromium.org/skia/52bc09f869c58a11/+/annotations

Original change's description:
> Make RGB_888x pixel operations work.
>
> Also remove vulkan-specific conversions in GrVkGpu and rely
> on higher level SurfaceContext to convert correctly.
>
> Bug: skia:8862
> Change-Id: Ib8b0541c8c5831148b7129c4bbed3f925660116e
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/392378
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

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

Change-Id: I5358e0ba4d0f1dc24cc5c37dd86c401a3a6b6076
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:8862
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/392840
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrSurfaceContext.cpp b/src/gpu/GrSurfaceContext.cpp
index f98b377..31b6534 100644
--- a/src/gpu/GrSurfaceContext.cpp
+++ b/src/gpu/GrSurfaceContext.cpp
@@ -615,13 +615,13 @@
     pt.fY = flip ? dstSurface->height() - pt.fY - src[0].height() : pt.fY;
 
     if (!dContext->priv().drawingManager()->newWritePixelsTask(
-                sk_ref_sp(dstProxy),
-                SkIRect::MakePtSize(pt, src[0].dimensions()),
-                allowedColorType,
-                this->colorInfo().colorType(),
-                srcLevels.begin(),
-                numLevels,
-                prepForSampling)) {
+            sk_ref_sp(dstProxy),
+            SkIRect::MakePtSize(pt, src[0].dimensions()),
+            this->colorInfo().colorType(),
+            allowedColorType,
+            srcLevels.begin(),
+            numLevels,
+            prepForSampling)) {
         return false;
     }
     if (numLevels > 1) {