Update net/third_party/nss to NSS 3.15.4.

net/third_party/nss/patches/nullcipher_934016.patch

Index: net/third_party/nss/patches/nullcipher_934016.patch
===================================================================
--- net/third_party/nss/patches/nullcipher_934016.patch	(revision 242942)
+++ net/third_party/nss/patches/nullcipher_934016.patch	(working copy)
@@ -1,16 +0,0 @@
-diff --git a/net/third_party/nss/ssl/ssl3con.c b/net/third_party/nss/ssl/ssl3con.c
-index 8395f61..8b8b758 100644
---- a/net/third_party/nss/ssl/ssl3con.c
-+++ b/net/third_party/nss/ssl/ssl3con.c
-@@ -859,6 +859,11 @@ static SECStatus
- Null_Cipher(void *ctx, unsigned char *output, int *outputLen, int maxOutputLen,
- 	    const unsigned char *input, int inputLen)
- {
-+    if (inputLen > maxOutputLen) {
-+        *outputLen = 0;  /* Match PK11_CipherOp in setting outputLen */
-+        PORT_SetError(SEC_ERROR_OUTPUT_LEN);
-+        return SECFailure;
-+    }
-     *outputLen = inputLen;
-     if (input != output)
- 	PORT_Memcpy(output, input, inputLen);