Move FileEnumerator to its own file, do some refactoring.

webkit/browser/fileapi/sandbox_origin_database.cc

Index: webkit/browser/fileapi/sandbox_origin_database.cc
diff --git a/webkit/browser/fileapi/sandbox_origin_database.cc b/webkit/browser/fileapi/sandbox_origin_database.cc
index fffa006b960b5b299809f8344d734eae9b40ff71..bb882367ba5b6b4b4ec3a282930aacb9adecd89e 100644
--- a/webkit/browser/fileapi/sandbox_origin_database.cc
+++ b/webkit/browser/fileapi/sandbox_origin_database.cc
@@ -8,6 +8,7 @@
 #include <utility>
 
 #include "base/file_util.h"
+#include "base/files/file_enumerator.h"
 #include "base/format_macros.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ -127,9 +128,9 @@ bool SandboxOriginDatabase::RepairDatabase(const std::string& db_path) {
 
   // See if the repaired entries match with what we have on disk.
   std::set<base::FilePath> directories;
-  file_util::FileEnumerator file_enum(file_system_directory_,
-                                      false /* recursive */,
-                                      file_util::FileEnumerator::DIRECTORIES);
+  base::FileEnumerator file_enum(file_system_directory_,
+                                 false /* recursive */,
+                                 base::FileEnumerator::DIRECTORIES);
   base::FilePath path_each;
   while (!(path_each = file_enum.Next()).empty())
     directories.insert(path_each.BaseName());