Move SkNoncopyable to include/private.

Change-Id: I62f60ea52faeebddecacf03d9429ac3f7c516b8e
Reviewed-on: https://skia-review.googlesource.com/141823
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
diff --git a/src/utils/SkJSON.h b/src/utils/SkJSON.h
index 8baf9fb..762c172 100644
--- a/src/utils/SkJSON.h
+++ b/src/utils/SkJSON.h
@@ -9,6 +9,7 @@
 #define SkJSON_DEFINED
 
 #include "SkArenaAlloc.h"
+#include "SkNoncopyable.h"
 #include "SkTo.h"
 #include "SkTypes.h"