[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 b5e2558cc60dd7d3bea88a9c915e16c42e28834e..14d98854d2a13dac973a32fe4499add3fc79ff0e 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
@@ -40,8 +40,6 @@ 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();