Delete the omahaproxy-backed extension blacklist and clear its entries from the

chrome/browser/extensions/updater/extension_downloader_delegate.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_
 
 #include <set>
 #include <string>
 
@@ skipping 71 matching lines @@
   // successfully downloaded to |path|. Ownership of that file is transferred
   // to the delegate.
   virtual void OnExtensionDownloadFinished(
       const std::string& id,
       const base::FilePath& path,
       const GURL& download_url,
       const std::string& version,
       const PingResult& ping_result,
       const std::set<int>& request_ids) = 0;
 
-  // Same as OnExtensionDownloadFinished() but only for the kBlacklistAppID
-  // extension, which passes different data to the delegate.
-  virtual void OnBlacklistDownloadFinished(
-      const std::string& data,
-      const std::string& package_hash,
-      const std::string& version,
-      const PingResult& ping_result,
-      const std::set<int>& request_ids) = 0;
-
   // The remaining methods are used by the ExtensionDownloader to retrieve
   // information about extensions from the delegate.
 
   // Invoked to fill the PingData for the given extension id. Returns false
   // if PingData should not be included for this extension's update check
   // (this is the default).
   virtual bool GetPingDataForExtension(const std::string& id,
                                        ManifestFetchData::PingData* ping);
 
   // Invoked to get the update url data for this extension's update url, if
   // there is any. The default implementation returns an empty string.
   virtual std::string GetUpdateUrlData(const std::string& id);
 
   // Invoked to determine whether extension |id| is currently
   // pending installation.
   virtual bool IsExtensionPending(const std::string& id) = 0;
 
   // Invoked to get the current version of extension |id|. Returns false if
   // that extension is not installed.
   virtual bool GetExtensionExistingVersion(const std::string& id,
                                            std::string* version) = 0;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_DELEGATE_H_