Make GrClip.h private

BUG=skia:

Change-Id: I4aa3c2707811ece3a63d161035e316c3bbc1cd15
Reviewed-on: https://skia-review.googlesource.com/9482
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/effects/GrConfigConversionEffect.cpp b/src/gpu/effects/GrConfigConversionEffect.cpp
index d629902..7bdcaf5 100644
--- a/src/gpu/effects/GrConfigConversionEffect.cpp
+++ b/src/gpu/effects/GrConfigConversionEffect.cpp
@@ -6,13 +6,14 @@
  */
 
 #include "GrConfigConversionEffect.h"
+#include "../private/GrGLSL.h"
+#include "GrClip.h"
 #include "GrContext.h"
 #include "GrRenderTargetContext.h"
 #include "GrSimpleTextureEffect.h"
 #include "SkMatrix.h"
 #include "glsl/GrGLSLFragmentProcessor.h"
 #include "glsl/GrGLSLFragmentShaderBuilder.h"
-#include "../private/GrGLSL.h"
 
 class GrGLConfigConversionEffect : public GrGLSLFragmentProcessor {
 public: