update obsolete code.google.com documentation links

extensions/common/api/declarative_web_request.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": "declarativeWebRequest",
     "description": "<em><strong>Note:</strong> this API is currently on hold, without concrete plans to move to stable.</em> Use the <code>chrome.declarativeWebRequest</code> API to intercept, block, or modify requests in-flight. It is significantly faster than the <a href='webRequest'><code>chrome.webRequest</code> API</a> because you can register rules that are evaluated in the browser rather than the JavaScript engine with reduces roundtrip latencies and allows higher efficiency.",
     "types": [
       {
@@ skipping 166 matching lines @@
         "type": "object",
         "properties": {
           "instanceType": {
             "type": "string", "enum": ["declarativeWebRequest.RedirectToEmptyDocument"],
             "nodoc": true
           }
         }
       },
       {
         "id": "declarativeWebRequest.RedirectByRegEx",
-        "description": "Redirects a request by applying a regular expression on the URL. The regular expressions use the <a href=\"http://code.google.com/p/re2/wiki/Syntax\">RE2 syntax</a>.",
+        "description": "Redirects a request by applying a regular expression on the URL. The regular expressions use the <a href=\"https://github.com/google/re2/blob/master/doc/syntax.txt\">RE2 syntax</a>.",
         "type": "object",
         "properties": {
           "instanceType": {
             "type": "string", "enum": ["declarativeWebRequest.RedirectByRegEx"],
             "nodoc": true
           },
           "from": {
             "type": "string",
             "description": "A match pattern that may contain capture groups. Capture groups are referenced in the Perl syntax ($1, $2, ...) instead of the RE2 syntax (\\1, \\2, ...) in order to be closer to JavaScript Regular Expressions."
           },
@@ skipping 390 matching lines @@
               "tabId": {"type": "integer", "description": "The ID of the tab in which the request takes place. Set to -1 if the request isn't related to a tab."},
               "type": {"type": "string", "enum": ["main_frame", "sub_frame", "stylesheet", "script", "image", "object", "xmlhttprequest", "other"], "description": "How the requested resource will be used."},
               "timeStamp": {"type": "number", "description": "The time when this signal is triggered, in milliseconds since the epoch."}
             }
           }
         ]
       }
     ]
   }
 ]