Move internal calls from GrContext to GrContextPriv

A mechanical bulk move just to get these out of the public API.

TBR=bsalomon@google.com
Change-Id: I813efbd54a09dd448275697c0e50947753a5cfd3
Reviewed-on: https://skia-review.googlesource.com/112262
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/tests/ClearTest.cpp b/tests/ClearTest.cpp
index 7424c5a..429b9e1 100644
--- a/tests/ClearTest.cpp
+++ b/tests/ClearTest.cpp
@@ -42,8 +42,9 @@
 }
 
 sk_sp<GrRenderTargetContext> newRTC(GrContext* context, int w, int h) {
-    return context->makeDeferredRenderTargetContext(SkBackingFit::kExact, w, h,
-                                                    kRGBA_8888_GrPixelConfig, nullptr);
+    return context->contextPriv().makeDeferredRenderTargetContext(
+                                                                SkBackingFit::kExact, w, h,
+                                                                kRGBA_8888_GrPixelConfig, nullptr);
 }
 
 static void clear_op_test(skiatest::Reporter* reporter, GrContext* context) {