Move temp file functions to base namespace.

chrome/browser/sync/test/integration/sync_extension_helper.cc

Index: chrome/browser/sync/test/integration/sync_extension_helper.cc
diff --git a/chrome/browser/sync/test/integration/sync_extension_helper.cc b/chrome/browser/sync/test/integration/sync_extension_helper.cc
index e7ff318079f87514a218c37e1596694918504206..0979ef44b7c1821f270372302f48bbb4fc0b230d 100644
--- a/chrome/browser/sync/test/integration/sync_extension_helper.cc
+++ b/chrome/browser/sync/test/integration/sync_extension_helper.cc
@@ -312,8 +312,8 @@ scoped_refptr<Extension> CreateExtension(const base::FilePath& base_dir,
     ADD_FAILURE();
     return NULL;
   }
-  if (!file_util::CreateTemporaryDirInDir(
-          base_dir, sub_dir.value(), &extension_dir)) {
+  if (!base::CreateTemporaryDirInDir(base_dir, sub_dir.value(),
+                                     &extension_dir)) {
     ADD_FAILURE();
     return NULL;
   }