Clean up Noto Sans UI stuff.

ui/base/font_helper_chromeos.h

Index: ui/base/font_helper_chromeos.h
diff --git a/ui/base/font_helper_chromeos.h b/ui/base/font_helper_chromeos.h
deleted file mode 100644
index e2013ce2e23bcb4c68f4d38a514807c423556ae9..0000000000000000000000000000000000000000
--- a/ui/base/font_helper_chromeos.h
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef UI_BASE_FONT_HELPER_CHROMEOS_H
-#define UI_BASE_FONT_HELPER_CHROMEOS_H
-
-#include <string>
-
-namespace ui {
-
-// This is a temporary helper function for the Roboto UI font experiment.
-// It'll go away once the experiment is over.
-// See http://crbug.com/434400 and http://crbug.com/448948 for more details.
-//
-// "Noto Sans UI" was the primary UI font (both native and web) in most
-// locales and we're replacing it with 'Roboto'. For now 'Roboto' is enabled by
-// default and can be disabled by setting 'disable-roboto-font-ui' flag to on.
-void ReplaceNotoSansWithRobotoIfEnabled(std::string* font_family);
-
-}  // namespace ui
-
-#endif  // UI_BASE_FONT_HELPER_CHROMEOS_H