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/ApplyGammaTest.cpp b/tests/ApplyGammaTest.cpp
index 8eb35e1..d210e9e 100644
--- a/tests/ApplyGammaTest.cpp
+++ b/tests/ApplyGammaTest.cpp
@@ -12,6 +12,7 @@
 #include "GrCaps.h"
 #include "GrContext.h"
 #include "GrContextFactory.h"
+#include "GrContextPriv.h"
 #include "GrShaderCaps.h"
 #include "GrTypes.h"
 #include "SkBitmap.h"
@@ -120,7 +121,7 @@
     SkAutoTMalloc<uint32_t> read(kW * kH);
 
     // We allow more error on GPUs with lower precision shader variables.
-    float error = context->caps()->shaderCaps()->halfIs32Bits() ? 0.5f : 1.2f;
+    float error = context->contextPriv().caps()->shaderCaps()->halfIs32Bits() ? 0.5f : 1.2f;
 
     for (auto toSRGB : { false, true }) {
         sk_sp<SkSurface> dst(SkSurface::MakeRenderTarget(context, SkBudgeted::kNo, ii));