Remove .html extension from links

chrome/common/extensions/api/webview.json

 // Copyright (c) 2013 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.
 
 [
   {
     "namespace": "webview",
     "description": "none",
     "dependencies": ["contextMenusInternal"],
     "types": [
@@ skipping 133 matching lines @@
                   { "type": "integer" },
                   { "type": "string" }
                 ],
                 "optional": true,
                 "description": "The ID of a parent menu item; this makes the item a child of a previously added item."
               },
               "documentUrlPatterns": {
                 "type": "array",
                 "items": {"type": "string"},
                 "optional": true,
-                "description": "Lets you restrict the item to apply only to documents whose URL matches one of the given patterns. (This applies to frames as well.) For details on the format of a pattern, see <a href='match_patterns.html'>Match Patterns</a>."
+                "description": "Lets you restrict the item to apply only to documents whose URL matches one of the given patterns. (This applies to frames as well.) For details on the format of a pattern, see <a href='match_patterns'>Match Patterns</a>."
               },
               "targetUrlPatterns": {
                 "type": "array",
                 "items": {"type": "string"},
                 "optional": true,
                 "description": "Similar to documentUrlPatterns, but lets you filter based on the src attribute of img/audio/video tags and the href of anchor tags."
               },
               "enabled": {
                 "type": "boolean",
                 "optional": true,
@@ skipping 528 matching lines @@
       {
         "name": "onClicked",
         "type": "function",
         "nodoc": true,
         "$ref": "contextMenusInternal.onClicked"
       }
     ]
   }
 ]