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/src/gpu/ops/GrLatticeOp.cpp b/src/gpu/ops/GrLatticeOp.cpp
index 6b9a448..948b7db 100644
--- a/src/gpu/ops/GrLatticeOp.cpp
+++ b/src/gpu/ops/GrLatticeOp.cpp
@@ -398,8 +398,8 @@
     GrSurfaceOrigin origin =
             random->nextBool() ? kTopLeft_GrSurfaceOrigin : kBottomLeft_GrSurfaceOrigin;
     const GrBackendFormat format =
-            context->contextPriv().caps()->getBackendFormatFromColorType(kRGBA_8888_SkColorType);
-    auto proxy = context->contextPriv().proxyProvider()->createProxy(
+            context->priv().caps()->getBackendFormatFromColorType(kRGBA_8888_SkColorType);
+    auto proxy = context->priv().proxyProvider()->createProxy(
             format, desc, origin, SkBackingFit::kExact, SkBudgeted::kYes);
 
     do {