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/ReadPixelsTest.cpp b/tests/ReadPixelsTest.cpp
index 29e50ff..46c7d14 100644
--- a/tests/ReadPixelsTest.cpp
+++ b/tests/ReadPixelsTest.cpp
@@ -543,7 +543,7 @@
             sk_sp<GrTextureProxy> proxy = sk_gpu_test::MakeTextureProxyFromData(
                     context, isRT, DEV_W, DEV_H, bmp.colorType(), origin, bmp.getPixels(),
                     bmp.rowBytes());
-            sk_sp<GrSurfaceContext> sContext = context->contextPriv().makeWrappedSurfaceContext(
+            sk_sp<GrSurfaceContext> sContext = context->priv().makeWrappedSurfaceContext(
                                                                                 std::move(proxy));
             auto info = SkImageInfo::Make(DEV_W, DEV_H, kN32_SkColorType, kPremul_SkAlphaType);
             test_readpixels_texture(reporter, std::move(sContext), info);