Separate out some more ICU from base and into base/i18n....

base/i18n/file_util_icu.h

+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// File utilities that use the ICU library go in this file.
+
+#include <string>
+
+#include "base/string16.h"
+
+class FilePath;
+
+namespace file_util {
+
+// Returns true if file_name does not have any illegal character. The input
+// param has the same restriction as that for ReplaceIllegalCharacters.
+bool IsFilenameLegal(const string16& file_name);
+
+// Replaces characters in 'file_name' that are illegal for file names with
+// 'replace_char'. 'file_name' must not be a full or relative path, but just the
+// file name component. Any leading or trailing whitespace in 'file_name' is
+// removed.
+// Example:
+//   file_name == "bad:file*name?.txt", changed to: "bad-file-name-.txt" when
+//   'replace_char' is '-'.
+void ReplaceIllegalCharacters(std::wstring* file_name, int replace_char);
+
+// Compares two filenames using the current locale information. This can be
+// used to sort directory listings. It behaves like "operator<" for use in
+// std::sort.
+bool LocaleAwareCompareFilenames(const FilePath& a, const FilePath& b);
+
+}  // namespace file_util