[webui] mark 2 files as deprecated

chrome/browser/resources/shared/js/local_strings.js

Index: chrome/browser/resources/shared/js/local_strings.js
diff --git a/chrome/browser/resources/shared/js/local_strings.js b/chrome/browser/resources/shared/js/local_strings.js
index a906c1b91962ded058fcef7420a9aa051b26457a..3209612e2ff518f9e7cd5ce93b2240bcdba7d853 100644
--- a/chrome/browser/resources/shared/js/local_strings.js
+++ b/chrome/browser/resources/shared/js/local_strings.js
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(arv): Namespace
-
 /**
+ * NOTE: The use of this file is deprecated. Use load_time_data.js instead.
+ *
  * The local strings get injected into the page using a variable named
  * {@code templateData}. This class provides a simpler interface to access those
  * strings.