opt into new virtual signature for SkVertices

Bug: skia:9984
Change-Id: Ib6e455522db9c73e9bba95ec28a96e4f6a92c8d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2085119Reviewed-by: Florin Malita <fmalita@chromium.org>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
Cr-Commit-Position: refs/heads/master@{#746530}

skia/config/SkUserConfig.h

@@ -218,10 +218,6 @@ SK_API void SkDebugf_FileLine(const char* file,
 #define SK_SUPPORT_LEGACY_AAA_CHOICE
 #endif
 
-#ifndef SK_SUPPORT_LEGACY_DRAWVERTS_VIRTUAL
-#define SK_SUPPORT_LEGACY_DRAWVERTS_VIRTUAL
-#endif
-
 // We're turning this off indefinitely,
 // until we can figure out some fundamental problems with its approach.
 //