update obsolete code.google.com documentation links

chrome/common/extensions/api/declarative_content.json

 // Copyright (c) 2012 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": "declarativeContent",
     "description": "Use the <code>chrome.declarativeContent</code> API to take actions depending on the content of a page, without requiring permission to read the page's content.",
     "types": [
       {
@@ skipping 19 matching lines @@
             "optional": true,
             "description": "Matches if all of the CSS selectors in the array match displayed elements in a frame with the same origin as the page's main frame.  All selectors in this array must be <a href=\"http://www.w3.org/TR/selectors4/#compound\">compound selectors</a> to speed up matching.  Note that listing hundreds of CSS selectors or CSS selectors that match hundreds of times per page can still slow down web sites.",
             // TODO(jyasskin): Figure out if we want to require all
             // the selectors to match in the same frame, or allow several
             // frames to contribute to a match.
             "items": { "type": "string" }
 //        },
 //          TODO: "text": {
 //            "type": "array",
 //            "optional": true,
-//            "description": "Matches if all of the regular expressions in the array match text in the page. The regular expressions use the <a href=\"http://code.google.com/p/re2/wiki/Syntax\">RE2 syntax</a>.",
+//            "description": "Matches if all of the regular expressions in the array match text in the page. The regular expressions use the <a href=\"https://github.com/google/re2/blob/master/doc/syntax.txt\">RE2 syntax</a>.",
 //            "items": { "type": "string" }
           },
           "isBookmarked": {
             "type": "boolean",
             "description": "Matches if the bookmarked state of the page is equal to the specified value. Requres the <a href='declare_permissions'>bookmarks permission</a>.",
             "optional": true
           },
           "instanceType": {
             "type": "string", "enum": ["declarativeContent.PageStateMatcher"],
             "nodoc": true
@@ skipping 90 matching lines @@
           "actions": [
             "declarativeContent.RequestContentScript",
             "declarativeContent.SetIcon",
             "declarativeContent.ShowPageAction"
           ]
         }
       }
     ]
   }
 ]