Simplify GrSmallPathRenderer::visitProxies

As noted at line 341, the SmallPathOp doesn't reliably know the
proxies that will be used by the atlas when visitProxies is called.
Deleting this code gives us a bit more flexibility for upcoming
refactorings.

Change-Id: I0292e750ed46c8555a75d1b5fa2710f1f616b70b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/308220
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

src/gpu/ops/GrSmallPathRenderer.cpp

@@ -273,12 +273,6 @@ public:
 
     void visitProxies(const VisitProxyFunc& func) const override {
         fHelper.visitProxies(func);
-
-        const GrSurfaceProxyView* views = fAtlas->getViews();
-        for (uint32_t i = 0; i < fAtlas->numActivePages(); ++i) {
-            SkASSERT(views[i].proxy());
-            func(views[i].proxy(), GrMipmapped::kNo);
-        }
     }
 
 #ifdef SK_DEBUG