drive: Replace GetResourceListCallback in DriveServiceInterface with FileListCallback

chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc

Index: chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc
diff --git a/chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc b/chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc
index a53b9566770bd87fc61095854b3bf7529437ec59..2feeff32c470617aaa6afedcf88c23209a60f8f5 100644
--- a/chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc
+++ b/chrome/browser/sync_file_system/drive_backend/drive_backend_util.cc
@@ -182,23 +182,6 @@ std::string GetMimeTypeFromTitle(const base::FilePath& title) {
   return mime_type;
 }
 
-scoped_ptr<google_apis::ResourceEntry> GetOldestCreatedFolderResource(
-    ScopedVector<google_apis::ResourceEntry> candidates) {
-  scoped_ptr<google_apis::ResourceEntry> oldest;
-  for (size_t i = 0; i < candidates.size(); ++i) {
-    google_apis::ResourceEntry* entry = candidates[i];
-    if (!entry->is_folder() || entry->deleted())
-      continue;
-
-    if (!oldest || oldest->published_time() > entry->published_time()) {
-      oldest.reset(entry);
-      candidates[i] = NULL;
-    }
-  }
-
-  return oldest.Pass();
-}
-
 SyncStatusCode GDataErrorCodeToSyncStatusCode(
     google_apis::GDataErrorCode error) {
   // NOTE: Please update DriveFileSyncService::UpdateServiceState when you add