Move the NSS functions out of CertDatabase into a new NSSCertDatabase class.

net/base/cert_database_mac.cc

Index: net/base/cert_database_mac.cc
diff --git a/net/base/cert_database_mac.cc b/net/base/cert_database_mac.cc
index 5e97faea6812973463e4ca1ba43b0730893acd6e..8214cf7073ac6fbff2dc86800402f65e9a48c778 100644
--- a/net/base/cert_database_mac.cc
+++ b/net/base/cert_database_mac.cc
@@ -15,9 +15,6 @@
 
 namespace net {
 
-CertDatabase::CertDatabase() {
-}
-
 int CertDatabase::CheckUserCert(X509Certificate* cert) {
   if (!cert)
     return ERR_CERT_INVALID;
@@ -48,7 +45,7 @@ int CertDatabase::AddUserCert(X509Certificate* cert) {
   }
   switch (err) {
     case noErr:
-      CertDatabase::NotifyObserversOfUserCertAdded(cert);
+      CertDatabase::NotifyObserversOfCertAdded(cert);
       // Fall through.
     case errSecDuplicateItem:
       return OK;