Move directory creation functions to base namespace.

chromeos/dbus/session_manager_client.cc

Index: chromeos/dbus/session_manager_client.cc
diff --git a/chromeos/dbus/session_manager_client.cc b/chromeos/dbus/session_manager_client.cc
index 441c693fb8cf3c4d86e6ca4ff7858ae5a03c1a44..7db7928b94371cdb3c790cbac283b1a5a765837c 100644
--- a/chromeos/dbus/session_manager_client.cc
+++ b/chromeos/dbus/session_manager_client.cc
@@ -628,7 +628,7 @@ class SessionManagerClientStubImpl : public SessionManagerClient {
   static void StoreFileInBackground(const base::FilePath& path,
                                     const std::string& data) {
     const int size = static_cast<int>(data.size());
-    if (!file_util::CreateDirectory(path.DirName()) ||
+    if (!base::CreateDirectory(path.DirName()) ||
         file_util::WriteFile(path, data.data(), size) != size) {
       LOG(WARNING) << "Failed to write policy key to " << path.value();
     }