[Sync] Rip out overly-complicated ExtensionData class

chrome/browser/sync/glue/extension_sync.h

 // 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_H_
 #define CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_H_
 #pragma once
 
 // This file contains functions necessary for syncing
 // extensions-related data types.
 
 #include <map>
 #include <string>
 
 class ExtensionServiceInterface;
-class Profile;
-class ProfileSyncService;
+struct ExtensionSyncData;
 
 namespace sync_api {
 struct UserShare;
 }  // namespace sync_api
 
 namespace sync_pb {
 class ExtensionSpecifics;
 }  // namespace sync_pb
 
 namespace browser_sync {
 
-class ExtensionData;
 struct ExtensionSyncTraits;
 
-// A map from extension IDs to ExtensionData objects.
-typedef std::map<std::string, ExtensionData> ExtensionDataMap;
+// A map from extension IDs to ExtensionSyncData objects.
+typedef std::map<std::string, ExtensionSyncData> ExtensionDataMap;
 
 // Fills in |has_children| with whether or not the root node with the
 // given tag has child nodes.  Returns true iff the lookup succeeded.
 //
 // TODO(akalin): Move this somewhere where it can be used by
 // other data types.
 bool RootNodeHasChildren(const char* tag,
                          sync_api::UserShare* user_share,
                          bool* has_children);
 
@@ skipping 27 matching lines @@
                       std::string* error);
 
 // Removes the server data for the given extension ID.
 void RemoveServerData(const ExtensionSyncTraits& traits,
                       const std::string& id,
                       sync_api::UserShare* user_share);
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_GLUE_EXTENSION_SYNC_H_