[SyncFS] Expand simple functions to their caller in drive_backend/

chrome/browser/sync_file_system/drive_backend/list_changes_task.h

Index: chrome/browser/sync_file_system/drive_backend/list_changes_task.h
diff --git a/chrome/browser/sync_file_system/drive_backend/list_changes_task.h b/chrome/browser/sync_file_system/drive_backend/list_changes_task.h
index fb2725db7f5b8a613c295d5cd37b1222f23e871c..8dd14542a743b9ed7cc9da2236bf6a412ce873fe 100644
--- a/chrome/browser/sync_file_system/drive_backend/list_changes_task.h
+++ b/chrome/browser/sync_file_system/drive_backend/list_changes_task.h
@@ -43,8 +43,6 @@ class ListChangesTask : public SyncTask {
                       scoped_ptr<google_apis::ChangeList> change_list);
   void CheckInChangeList(int64 largest_change_id,
                          scoped_ptr<SyncTaskToken> token);
-  void DidCheckInChangeList(scoped_ptr<SyncTaskToken> token,
-                            SyncStatusCode status);
 
   bool IsContextReady();
   MetadataDatabase* metadata_database();