No longer forward refs and unrefs from the GrSurfaceProxy to the backing GrSurface

This is setting up for GrIORefProxy to just become SkRefCnt and GrProxyRef to just become sk_sp.

Change-Id: Ica66565a353de980a7070e0788f1f2b17565baee
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/220297
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrTextureProxy.cpp b/src/gpu/GrTextureProxy.cpp
index cbfbc25..6a9fd26 100644
--- a/src/gpu/GrTextureProxy.cpp
+++ b/src/gpu/GrTextureProxy.cpp
@@ -46,7 +46,7 @@
         , fDeferredUploader(nullptr) {
     if (fTarget->getUniqueKey().isValid()) {
         fProxyProvider = fTarget->asTexture()->getContext()->priv().proxyProvider();
-        fProxyProvider->adoptUniqueKeyFromSurface(this, fTarget);
+        fProxyProvider->adoptUniqueKeyFromSurface(this, fTarget.get());
     }
 }