[Sync] Rip out overly-complicated ExtensionData class

chrome/browser/sync/glue/extension_sync_traits.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 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_SYNC_GLUE_EXTENSION_SYNC_TRAITS_H_
 #define CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_TRAITS_H_
 #pragma once
 
 #include "chrome/browser/sync/syncable/model_type.h"
 
 class Extension;
@@ skipping 30 matching lines @@
 // successful.
 typedef bool (*ExtensionSpecificsEntityGetter)(
     const sync_pb::EntitySpecifics&, sync_pb::ExtensionSpecifics*);
 
 // Represents the properties needed for syncing data types that
 // involve extensions (e.g., "real" extensions, apps).
 struct ExtensionSyncTraits {
   ExtensionSyncTraits(
       syncable::ModelType model_type,
       IsValidAndSyncablePredicate is_valid_and_syncable,
-      ShouldHandleExtensionUninstallPredicate
-          should_handle_extension_uninstall,
       const char* root_node_tag,
       ExtensionSpecificsGetter extension_specifics_getter,
       ExtensionSpecificsSetter extension_specifics_setter,
       ExtensionSpecificsEntityGetter extension_specifics_entity_getter);
   ~ExtensionSyncTraits();
 
   // The sync type for the data type.
   const syncable::ModelType model_type;
   // A checker to make sure that the downloaded extension is valid and
   // syncable.
   const IsValidAndSyncablePredicate is_valid_and_syncable;
-  // A checker to know which extension uninstall events to handle.
-  const ShouldHandleExtensionUninstallPredicate
-      should_handle_extension_uninstall;
   // The tag with which the top-level data type node is marked.
   const char* const root_node_tag;
   // The function that retrieves a ExtensionSpecifics reference (which
   // may be embedded in another specifics object) from a sync node.
   const ExtensionSpecificsGetter extension_specifics_getter;
   // The function that embeds an ExtensionSpecifics into a sync node.
   const ExtensionSpecificsSetter extension_specifics_setter;
   // The function that retrieves a ExtensionSpecifics (if possible)
   // from an EntitySpecifics.
   ExtensionSpecificsEntityGetter extension_specifics_entity_getter;
 };
 
 // Gets traits for extensions sync.
 ExtensionSyncTraits GetExtensionSyncTraits();
 
 // Gets traits for apps sync.
 ExtensionSyncTraits GetAppSyncTraits();
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_TRAITS_H_