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/src/shaders/SkPictureShader.cpp b/src/shaders/SkPictureShader.cpp
index 42f5c3e..f958814 100644
--- a/src/shaders/SkPictureShader.cpp
+++ b/src/shaders/SkPictureShader.cpp
@@ -24,6 +24,7 @@
 #include "GrCaps.h"
 #include "GrColorSpaceInfo.h"
 #include "GrContext.h"
+#include "GrContextPriv.h"
 #include "GrFragmentProcessor.h"
 #endif
 
@@ -358,7 +359,7 @@
         const GrFPArgs& args) const {
     int maxTextureSize = 0;
     if (args.fContext) {
-        maxTextureSize = args.fContext->caps()->maxTextureSize();
+        maxTextureSize = args.fContext->contextPriv().caps()->maxTextureSize();
     }
 
     auto lm = this->totalLocalMatrix(args.fPreLocalMatrix, args.fPostLocalMatrix);