SkNonCopyable should be used with private inheritance.

src/gpu/GrAllocator.h

Index: src/gpu/GrAllocator.h
diff --git a/src/gpu/GrAllocator.h b/src/gpu/GrAllocator.h
index 4e47fb16076b8edfebf0b229b6fe05578a319a05..a2ad408e072d03b84352f423a6b76a78f55a0f4e 100644
--- a/src/gpu/GrAllocator.h
+++ b/src/gpu/GrAllocator.h
@@ -13,7 +13,7 @@
 #include "SkTArray.h"
 #include "SkTypes.h"
 
-class GrAllocator : public SkNoncopyable {
+class GrAllocator : SkNoncopyable {
 public:
     ~GrAllocator() {
         reset();
@@ -153,7 +153,7 @@ private:
 };
 
 template <typename T>
-class GrTAllocator : public SkNoncopyable {
+class GrTAllocator : SkNoncopyable {
 public:
     virtual ~GrTAllocator() { this->reset(); };