Move directory creation functions to base namespace.

crypto/nss_util.cc

Index: crypto/nss_util.cc
diff --git a/crypto/nss_util.cc b/crypto/nss_util.cc
index a74c8b65a4bdd7c1a99b8d20f8549d2257f5af14..82556b44128093b5eeebb68d498f94a6de6309db 100644
--- a/crypto/nss_util.cc
+++ b/crypto/nss_util.cc
@@ -85,7 +85,7 @@ base::FilePath GetDefaultConfigDirectory() {
     return dir;
   }
   dir = dir.AppendASCII(".pki").AppendASCII("nssdb");
-  if (!file_util::CreateDirectory(dir)) {
+  if (!base::CreateDirectory(dir)) {
     LOG(ERROR) << "Failed to create " << dir.value() << " directory.";
     dir.clear();
   }