Update NSPR to 4.12 and NSS to 3.23 on iOS

nss/lib/freebl/chacha20/chacha20.h

Index: nss/lib/freebl/chacha20/chacha20.h
diff --git a/nss/lib/freebl/chacha20/chacha20.h b/nss/lib/freebl/chacha20/chacha20.h
deleted file mode 100644
index 6336ba719ad0cb3a52ae9f5158ac6d2ab7156d8e..0000000000000000000000000000000000000000
--- a/nss/lib/freebl/chacha20/chacha20.h
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * chacha20.h - header file for ChaCha20 implementation.
- *
- * This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-#ifndef FREEBL_CHACHA20_H_
-#define FREEBL_CHACHA20_H_
-
-#include <stdint.h>
-
-/* ChaCha20XOR encrypts |inLen| bytes from |in| with the given key and
- * nonce and writes the result to |out|, which may be equal to |in|. The
- * initial block counter is specified by |counter|. */
-extern void ChaCha20XOR(unsigned char *out,
-			const unsigned char *in, unsigned int inLen,
-			const unsigned char key[32],
-			const unsigned char nonce[8],
-			uint64_t counter);
-
-#endif  /* FREEBL_CHACHA20_H_ */