Move GrOp::VisitProxyFunc to GrTypesPriv.h GrVisitProxyFunc

This is almost purely a query/replace CL (% the #include juggling).
The VisitProxyFunc is used by more than just the Ops and will probably
still be required in the NGA.

This is a prelude to making all the remaining GrOp-derived classes OGA-only.

Bug: skia:11837
Change-Id: If1c127e5c126c676be529ed2a61dd7953abb03d0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419162
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/gm/beziereffects.cpp b/gm/beziereffects.cpp
index 2858a6e..fe31a17 100644
--- a/gm/beziereffects.cpp
+++ b/gm/beziereffects.cpp
@@ -66,7 +66,7 @@
                 &GrUserStencilSettings::kUnused, caps, clampType, &fColor);
     }
 
-    void visitProxies(const VisitProxyFunc& func) const override {
+    void visitProxies(const GrVisitProxyFunc& func) const override {
         if (fProgramInfo) {
             fProgramInfo->visitFPProxies(func);
         } else {