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/SkJSONWriter.h b/src/utils/SkJSONWriter.h
index 6e579a5..09db543 100644
--- a/src/utils/SkJSONWriter.h
+++ b/src/utils/SkJSONWriter.h
@@ -8,6 +8,7 @@
 #ifndef SkJSONWriter_DEFINED
 #define SkJSONWriter_DEFINED
 
+#include "SkNoncopyable.h"
 #include "SkStream.h"
 #include "SkTArray.h"