Rename GrContext::contextPriv to priv

Mechanical. This makes the priv() accessor the same for all the context types.

Change-Id: I40850eb05a33b8d7cc3eabdd42226d24b2ba58aa
Reviewed-on: https://skia-review.googlesource.com/c/189164
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/tests/ClearTest.cpp b/tests/ClearTest.cpp
index c9e8e54..03bfc58 100644
--- a/tests/ClearTest.cpp
+++ b/tests/ClearTest.cpp
@@ -57,10 +57,9 @@
 
 sk_sp<GrRenderTargetContext> newRTC(GrContext* context, int w, int h) {
     const GrBackendFormat format =
-            context->contextPriv().caps()->getBackendFormatFromColorType(kRGBA_8888_SkColorType);
-    return context->contextPriv().makeDeferredRenderTargetContext(
-                                                                format, SkBackingFit::kExact, w, h,
-                                                                kRGBA_8888_GrPixelConfig, nullptr);
+            context->priv().caps()->getBackendFormatFromColorType(kRGBA_8888_SkColorType);
+    return context->priv().makeDeferredRenderTargetContext(format, SkBackingFit::kExact, w, h,
+                                                           kRGBA_8888_GrPixelConfig, nullptr);
 }
 
 static void clear_op_test(skiatest::Reporter* reporter, GrContext* context) {