Rename OperationObserver to OperationDelegate

chrome/browser/chromeos/drive/file_system/operation_observer.cc

Index: chrome/browser/chromeos/drive/file_system/operation_observer.cc
diff --git a/chrome/browser/chromeos/drive/file_system/operation_observer.cc b/chrome/browser/chromeos/drive/file_system/operation_observer.cc
deleted file mode 100644
index 79f0f8644b17d19cd6cfdae61536f974aaa52553..0000000000000000000000000000000000000000
--- a/chrome/browser/chromeos/drive/file_system/operation_observer.cc
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2014 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.
-
-#include "chrome/browser/chromeos/drive/file_system/operation_observer.h"
-
-namespace drive {
-namespace file_system {
-
-bool OperationObserver::WaitForSyncComplete(
-    const std::string& local_id,
-    const FileOperationCallback& callback) {
-  return false;
-}
-
-}  // namespace file_system
-}  // namespace drive