Add "scrypt" to third_party for secure password hashes

third_party/scrypt/README.chromium

Index: third_party/scrypt/README.chromium
diff --git a/third_party/scrypt/README.chromium b/third_party/scrypt/README.chromium
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+Short Name: scrypt
+Name: Secure Encryption
+Version: 1.1.6
+URL: http://www.tarsnap.com/scrypt.html
+Date: 2012-12-13
+License: 2-clause BSD license
+License File: LICENSE
+Security Critical: yes
+
+Description:
+The scrypt key derivation function was originally developed for use in
+the Tarsnap online backup system and is designed to be far more secure
+against hardware brute-force attacks than alternative functions such
+as PBKDF2 or bcrypt.
+
+We estimate that on modern (2009) hardware, if 5 seconds are spent
+computing a derived key, the cost of a hardware brute-force attack
+against scrypt is roughly 4000 times greater than the cost of a
+similar attack against bcrypt (to find the same password), and 20000
+times greater than a similar attack against PBKDF2.
+
+Local Modifications:
+chromium.patch
+- make it compile under Windows and accessible from C++
+- no functional changes