Revert "Migrate GrSurfaceContext readPixels to take direct context"

This reverts commit d169e1915cba8caaddabb22b3672c7cefa91bfa2.

Reason for revert: broke chrome via code generator

Original change's description:
> Migrate GrSurfaceContext readPixels to take direct context
> 
> After this lands we'll proceed up the stack and add the direct
> context requirement to the public API and SkImage.
> 
> Bug: skia:104662
> Change-Id: I4b2d779a7fcd65eec68e631757821ac8e136ddba
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/309044
> Commit-Queue: Adlai Holler <adlai@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>

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

Change-Id: I6126f2dca4bc902c903512ac486e22841cc472e5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:104662
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/309281
Reviewed-by: Adlai Holler <adlai@google.com>
Commit-Queue: Adlai Holler <adlai@google.com>
diff --git a/tests/RenderTargetContextTest.cpp b/tests/RenderTargetContextTest.cpp
index 3b02881..0268a89 100644
--- a/tests/RenderTargetContextTest.cpp
+++ b/tests/RenderTargetContextTest.cpp
@@ -61,7 +61,7 @@
         SkAutoTMalloc<uint32_t> dstBuffer(kSize * kSize);
         static const size_t kRowBytes = sizeof(uint32_t) * kSize;
 
-        bool result = rtCtx->readPixels(dContext, dstInfo, dstBuffer.get(), kRowBytes, {0, 0});
+        bool result = rtCtx->readPixels(dstInfo, dstBuffer.get(), kRowBytes, {0, 0});
         REPORTER_ASSERT(reporter, result);
 
         check_instantiation_status(reporter, rtCtx.get(), true);