Move some more file utils to the base namespace.

content/browser/dom_storage/session_storage_database.cc

Index: content/browser/dom_storage/session_storage_database.cc
diff --git a/content/browser/dom_storage/session_storage_database.cc b/content/browser/dom_storage/session_storage_database.cc
index bac3df7a67baa7cee9b7dfc7c9a5c48459ef74ea..7b8dcd0bf0a674cd8dcb15b4f690d97bde4857fe 100644
--- a/content/browser/dom_storage/session_storage_database.cc
+++ b/content/browser/dom_storage/session_storage_database.cc
@@ -280,8 +280,7 @@ bool SessionStorageDatabase::LazyOpen(bool create_if_needed) {
     return true;
 
   if (!create_if_needed &&
-      (!base::PathExists(file_path_) ||
-       file_util::IsDirectoryEmpty(file_path_))) {
+      (!base::PathExists(file_path_) || base::IsDirectoryEmpty(file_path_))) {
     // If the directory doesn't exist already and we haven't been asked to
     // create a file on disk, then we don't bother opening the database. This
     // means we wait until we absolutely need to put something onto disk before