Recommit "Bring up Firefox Password Import Unittest on OS X."

chrome/test/data/firefox3_nss_mac/README

Index: chrome/test/data/firefox3_nss_mac/README
diff --git a/chrome/test/data/firefox3_nss_mac/README b/chrome/test/data/firefox3_nss_mac/README
new file mode 100644
index 0000000000000000000000000000000000000000..b54a99e2e43db2ebdef1ed17e7e62966b8b7c7a3
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+The NSPR and NSS DLLs in this directory (mozcrt19.dll, nss3.dll, nssutil3.dll
+plds4.dll, sqlite3.dll, freebl3.dll, nspr4.dll, nssdbm3.dll, plc4.dll, and
+softokn3.dll) come from the Firefox 3.0 distribution for Windows.
+
+The source code of NSPR and NSS, which you may use, modify, and distribute, is
+available to you free-of-charge from www.mozilla.org under the Mozilla Public
+License and other open source software licenses.
+
+The source code of sqlite3.dll is in the public domain.
+
+mozcrt19.dll is the Mozilla Custom C Runtime, in which Mozilla replaced the
+default allocator with jemalloc.  mozcrt19.dll is distributed in the object
+code form only and as part of the NSPR and NSS DLLs.