Update NSS to NSS 3.13.4 pre-release snapshot 20120319.

net/third_party/nss/README.chromium

 Name: Network Security Services (NSS)
 URL: http://www.mozilla.org/projects/security/pki/nss/
-Version: 3.13.3
+Version: 3.13.4 pre-release snapshot 20120319
 Security Critical: Yes
 
 This directory includes a copy of NSS's libssl from the CVS repo at:
   :pserver:anonymous@cvs-mirror.mozilla.org:/cvsroot
 
-The snapshot was updated to the CVS tag: NSS_3_13_3_RTM
+The snapshot was updated to the CVS tag: NSS_SSL_3_13_4_20120319_TAG
 
 Patches:
 
   * Commenting out a couple of functions because they need NSS symbols
     which may not exist in the system NSS library.
     patches/versionskew.patch
 
   * Send empty renegotiation info extension instead of SCSV unless TLS is
     disabled.
     patches/renegoscsv.patch
@@ skipping 15 matching lines @@
     patches/clientauth.patch
     ssl/sslplatf.c
 
   * Add a function to export whether the last handshake on a socket resumed a
     previous session.
     patches/didhandshakeresume.patch
     https://bugzilla.mozilla.org/show_bug.cgi?id=731798
 
   * Support origin bound certificates.
     http://balfanz.github.com/tls-obc-spec/draft-balfanz-tls-obc-00.txt
+    https://bugzilla.mozilla.org/show_bug.cgi?id=680292
     patches/origin_bound_certs.patch
 
-  * Add a function to implement RFC 5705: Keying Material Exporters for TLS
-    This is a reworked version of the patch from
-    https://bugzilla.mozilla.org/show_bug.cgi?id=507359
-    patches/secret_exporter.patch
-    patches/secret_exporter2.patch
-
   * Add a function to restart a handshake after a client certificate request.
     patches/restartclientauth.patch
 
   * Allow SSL_HandshakeNegotiatedExtension to be called before the handshake
     is finished.
     https://bugzilla.mozilla.org/show_bug.cgi?id=681839
     patches/negotiatedextension.patch
 
   * Support the encrypted client certificates extension.
     https://bugzilla.mozilla.org/show_bug.cgi?id=691991
     patches/encryptedclientcerts.patch
 
   * Add function to retrieve TLS client cert types requested by server.
     https://bugzilla.mozilla.org/show_bug.cgi?id=51413
     patches/getrequestedclientcerttypes.patch
 
-  * Fixed a clang warning in sslcon.c.
-    https://bugzilla.mozilla.org/show_bug.cgi?id=728919
-    patches/clang-sslcon.patch
-
-  * Fix a buffer length bug and miscellaneous nits in the next protocol 
-    negotiation (NPN) functions.
-    https://bugzilla.mozilla.org/show_bug.cgi?id=734534
-    patches/nextprotocleanup.patch
-
 Apply the patches to NSS by running the patches/applypatches.sh script.  Read
 the comments at the top of patches/applypatches.sh for instructions.
 
 The ssl/bodge directory contains files taken from the NSS repo that we required
 for building libssl outside of its usual build environment.