Move resourceProvider accessor to GrContextPriv

Change-Id: I5cddd620a7ec4b006b7359864ede58e9d4dd684e
Reviewed-on: https://skia-review.googlesource.com/94340
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/tests/WritePixelsTest.cpp b/tests/WritePixelsTest.cpp
index b3da67b..a41e8f4 100644
--- a/tests/WritePixelsTest.cpp
+++ b/tests/WritePixelsTest.cpp
@@ -504,7 +504,7 @@
 
         sk_sp<GrTextureProxy> temp = proxyProvider->createProxy(desc, SkBackingFit::kApprox,
                                                                 SkBudgeted::kYes);
-        temp->instantiate(context->resourceProvider());
+        temp->instantiate(context->contextPriv().resourceProvider());
     }
 
     // Create the surfaces and flush them to ensure there is no lingering pendingIO