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/GrAHardwareBufferTest.cpp b/tests/GrAHardwareBufferTest.cpp
index 5e5d4ed..c15fb1a 100644
--- a/tests/GrAHardwareBufferTest.cpp
+++ b/tests/GrAHardwareBufferTest.cpp
@@ -102,7 +102,7 @@
                                    GrSurfaceOrigin surfaceOrigin) {
 
     GrContext* context = info.grContext();
-    if (!context->contextPriv().caps()->supportsAHardwareBufferImages()) {
+    if (!context->priv().caps()->supportsAHardwareBufferImages()) {
         return;
     }