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/src/gpu/ops/GrSmallPathRenderer.cpp b/src/gpu/ops/GrSmallPathRenderer.cpp
index 030a5ab..83d65d8 100644
--- a/src/gpu/ops/GrSmallPathRenderer.cpp
+++ b/src/gpu/ops/GrSmallPathRenderer.cpp
@@ -137,7 +137,7 @@
 
     const char* name() const override { return "SmallPathOp"; }
 
-    void visitProxies(const VisitProxyFunc& func) const override {
+    void visitProxies(const GrVisitProxyFunc& func) const override {
         fHelper.visitProxies(func);
     }