Update net/third_party/nss to NSS 3.15.4.

net/third_party/nss/patches/disableticketrenewal.patch

Index: net/third_party/nss/patches/disableticketrenewal.patch
===================================================================
--- net/third_party/nss/patches/disableticketrenewal.patch	(revision 242942)
+++ net/third_party/nss/patches/disableticketrenewal.patch	(working copy)
@@ -1,17 +0,0 @@
-Index: net/third_party/nss/ssl/sslnonce.c
-===================================================================
---- net/third_party/nss/ssl/sslnonce.c	(revision 240143)
-+++ net/third_party/nss/ssl/sslnonce.c	(working copy)
-@@ -438,6 +438,12 @@
-     /* We need to lock the cache, as this sid might already be in the cache. */
-     LOCK_CACHE;
- 
-+    /* Don't modify sid if it has ever been cached. */
-+    if (sid->cached != never_cached) {
-+	UNLOCK_CACHE;
-+	return SECSuccess;
-+    }
-+
-     /* A server might have sent us an empty ticket, which has the
-      * effect of clearing the previously known ticket.
-      */