Allow autoupdate to update disabled extensions.

chrome/browser/extensions/extension_service.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_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 71 matching lines @@
 // various classes have on ExtensionService. This allows easy mocking.
 class ExtensionServiceInterface : public SyncableService {
  public:
   // A function that returns true if the given extension should be
   // included and false if it should be filtered out.  Identical to
   // PendingExtensionInfo::ShouldAllowInstallPredicate.
   typedef bool (*ExtensionFilter)(const Extension&);
 
   virtual ~ExtensionServiceInterface() {}
   virtual const ExtensionSet* extensions() const = 0;
+  virtual const ExtensionSet* disabled_extensions() const = 0;
   virtual PendingExtensionManager* pending_extension_manager() = 0;
 
   // Install an update.  Return true if the install can be started.
   // Set out_crx_installer to the installer if one was started.
   virtual bool UpdateExtension(
       const std::string& id,
       const FilePath& path,
       const GURL& download_url,
       CrxInstaller** out_crx_installer) = 0;
   virtual const Extension* GetExtensionById(const std::string& id,
@@ skipping 743 matching lines @@
   scoped_ptr<ExtensionGlobalError> extension_global_error_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_