Revert 231221 - "Remove enabled/disabled state from extension and app sync."

chrome/browser/extensions/extension_service.cc

 // Copyright (c) 2013 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 "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 
@@ skipping 1867 matching lines @@
     bool previously_disabled =
         extension_prefs_->IsExtensionDisabled(extension->id());
     // Legacy disabled extensions do not have a disable reason. Infer that if
     // there was no permission increase, it was likely disabled by the user.
     if (previously_disabled && disable_reasons == Extension::DISABLE_NONE &&
         !extension_prefs_->DidExtensionEscalatePermissions(extension->id())) {
       disable_reasons |= Extension::DISABLE_USER_ACTION;
     }
     // Extensions that came to us disabled from sync need a similar inference,
     // except based on the new version's permissions.
-    // TODO(yoz): Since we no longer sync disabled state, simplify this.
     if (previously_disabled &&
         disable_reasons == Extension::DISABLE_UNKNOWN_FROM_SYNC) {
       // Remove the DISABLE_UNKNOWN_FROM_SYNC reason.
       extension_prefs_->ClearDisableReasons(extension->id());
       if (!is_privilege_increase)
         disable_reasons |= Extension::DISABLE_USER_ACTION;
     }
     disable_reasons &= ~Extension::DISABLE_UNKNOWN_FROM_SYNC;
   }
 
@@ skipping 890 matching lines @@
 }
 
 void ExtensionService::AddUpdateObserver(extensions::UpdateObserver* observer) {
   update_observers_.AddObserver(observer);
 }
 
 void ExtensionService::RemoveUpdateObserver(
     extensions::UpdateObserver* observer) {
   update_observers_.RemoveObserver(observer);
 }