Make GrCaps and GrShaderCaps private.

Moves getCaps() from GrContext to GrContextPriv and removes unused refCaps().

Change-Id: Ic6a8951b656c0d1b2773eae73bff8e88af819866
Reviewed-on: https://skia-review.googlesource.com/127389
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/tests/TransferPixelsTest.cpp b/tests/TransferPixelsTest.cpp
index e17dfac..5ff2386 100755
--- a/tests/TransferPixelsTest.cpp
+++ b/tests/TransferPixelsTest.cpp
@@ -64,7 +64,7 @@
 
 void basic_transfer_test(skiatest::Reporter* reporter, GrContext* context, GrColorType colorType,
                          GrSurfaceOrigin origin, bool renderTarget) {
-    if (GrCaps::kNone_MapFlags == context->caps()->mapBufferFlags()) {
+    if (GrCaps::kNone_MapFlags == context->contextPriv().caps()->mapBufferFlags()) {
         return;
     }
 
@@ -111,8 +111,8 @@
             continue;
         }
 
-        if (!context->caps()->isConfigTexturable(desc.fConfig) ||
-            (renderTarget && !context->caps()->isConfigRenderable(desc.fConfig))) {
+        if (!context->contextPriv().caps()->isConfigTexturable(desc.fConfig) ||
+            (renderTarget && !context->contextPriv().caps()->isConfigRenderable(desc.fConfig))) {
             continue;
         }