Do not send or store cookies for extensions autoupdate http requests....

chrome/browser/extensions/extension_updater.h

 // Copyright (c) 2009 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_UPDATER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_UPDATER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 66 matching lines @@
     std::string version;
     ExtensionFetch() : id(""), url(), package_hash(""), version("") {}
     ExtensionFetch(const std::string& i, const GURL& u,
       const std::string& h, const std::string& v)
       : id(i), url(u), package_hash(h), version(v) {}
   };
 
   // These are needed for unit testing, to help identify the correct mock
   // URLFetcher objects.
   static const int kManifestFetcherId = 1;
-  static const int kExtensionFetcherId = 1;
+  static const int kExtensionFetcherId = 2;
 
   static const char* kBlacklistUpdateUrl;
   static const char* kBlacklistAppID;
 
   // Does common work from constructors.
   void Init();
 
   // Computes when to schedule the first update check.
   base::TimeDelta DetermineFirstCheckDelay();
 
@@ skipping 82 matching lines @@
   MessageLoop* io_loop_;
 
   PrefService* prefs_;
 
   scoped_refptr<ExtensionUpdaterFileHandler> file_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionUpdater);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_UPDATER_H_