SkNonCopyable should be used with private inheritance.

src/gpu/GrClipMaskCache.h

Index: src/gpu/GrClipMaskCache.h
diff --git a/src/gpu/GrClipMaskCache.h b/src/gpu/GrClipMaskCache.h
index 213e2823e37182648b35d259dd3a6fbb2738c891..b332c7be9b96e2daf8537344b1527bbdb414492f 100644
--- a/src/gpu/GrClipMaskCache.h
+++ b/src/gpu/GrClipMaskCache.h
@@ -18,7 +18,7 @@ class GrTexture;
  * The stencil buffer stores the last clip path - providing a single entry
  * "cache". This class provides similar functionality for AA clip paths
  */
-class GrClipMaskCache : public SkNoncopyable {
+class GrClipMaskCache : SkNoncopyable {
 public:
     GrClipMaskCache();