Skia: Enable new GrClipStack for gpu raster/composite

Bug: skia:10205
Change-Id: I9a9ef9ab522741f5ed3091884f1f202a310ba8d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2423314
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Cr-Commit-Position: refs/heads/master@{#810698}

skia/config/SkUserConfig.h

@@ -231,9 +231,6 @@ SK_API void SkDebugf_FileLine(const char* file,
 // Staging for Skia requiring GrDirectContext in SkImage::readPixels.
 #define SK_IMAGE_READ_PIXELS_LEGACY_API
 
-// Staging for Skia using a simpler clip stack implementation on GPU backends.
-#define SK_DISABLE_NEW_GR_CLIP_STACK
-
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,