Issue #1467 - Part 1: Set up conditional NSS-SQL builds.

- Adds buildconfig option --enable-nss-sqlstore
- Prefixes NSS dbinit with either sql: or dbm: depending on config
- Pre-initializes mozStorage when NSS-SQL storage is used to prevent
  an sqlite3_config race in NSS Init

security/manager/ssl/nsNSSComponent.cpp

@@ -12,6 +12,9 @@
 #include "SharedSSLState.h"
 #include "cert.h"
 #include "certdb.h"
+#ifdef NSS_SQLSTORE
+#include "mozStorageCID.h"
+#endif
 #include "mozilla/ArrayUtils.h"
 #include "mozilla/Casting.h"
 #include "mozilla/Preferences.h"
@@ -1970,6 +1973,14 @@ nsNSSComponent::Init()
     return NS_ERROR_NOT_SAME_THREAD;
   }
 
+#ifdef NSS_SQLSTORE
+  // To avoid an sqlite3_config race in NSS init, we require the storage service to get initialized first.
+  nsCOMPtr<nsISupports> storageService = do_GetService(MOZ_STORAGE_SERVICE_CONTRACTID);
+  if (!storageService) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+#endif
+
   nsresult rv = NS_OK;
 
   MOZ_LOG(gPIPNSSLog, LogLevel::Debug, ("Beginning NSS initialization\n"));