Refactor AO2TS to make it easier to componentize.

chrome/browser/extensions/updater/extension_updater_unittest.cc

 // 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.
 
 #include <list>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 369 matching lines @@
     return downloader.Pass();
   }
 
   scoped_ptr<ExtensionDownloader> CreateExtensionDownloaderWithIdentity(
       ExtensionDownloaderDelegate* delegate) {
     scoped_ptr<FakeIdentityProvider> fake_identity_provider;
     fake_token_service_.reset(new FakeOAuth2TokenService());
     fake_identity_provider.reset(new FakeIdentityProvider(
           fake_token_service_.get()));
     fake_identity_provider->LogIn(kFakeAccountId);
-    fake_token_service_->AddAccount(kFakeAccountId);
+    fake_token_service_->GetDelegate()->UpdateCredentials(kFakeAccountId,
+                                                          "refresh_token");
 
     scoped_ptr<ExtensionDownloader> downloader(
         CreateExtensionDownloader(delegate));
     downloader->SetWebstoreIdentityProvider(fake_identity_provider.Pass());
     return downloader.Pass();
   }
 
   scoped_ptr<FakeOAuth2TokenService> fake_token_service_;
 
   ExtensionDownloaderDelegate* downloader_delegate_override_;
@@ skipping 1850 matching lines @@
 // -prodversionmin (shouldn't update if browser version too old)
 // -manifests & updates arriving out of order / interleaved
 // -malformed update url (empty, file://, has query, has a # fragment, etc.)
 // -An extension gets uninstalled while updates are in progress (so it doesn't
 //  "come back from the dead")
 // -An extension gets manually updated to v3 while we're downloading v2 (ie
 //  you don't get downgraded accidentally)
 // -An update manifest mentions multiple updates
 
 }  // namespace extensions