gdata: Convert FindEntryByResourceIdSync() to asynchronous.

chrome/browser/chromeos/gdata/find_entry_callback.cc

Index: chrome/browser/chromeos/gdata/find_entry_callback.cc
diff --git a/chrome/browser/chromeos/gdata/find_entry_callback.cc b/chrome/browser/chromeos/gdata/find_entry_callback.cc
deleted file mode 100644
index 4dd6b0d0393ddfaf6287f340924cfc6fed728ede..0000000000000000000000000000000000000000
--- a/chrome/browser/chromeos/gdata/find_entry_callback.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2012 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/gdata/find_entry_callback.h"
-
-namespace gdata {
-
-void ReadOnlyFindEntryCallback(GDataEntry** out,
-                               base::PlatformFileError error,
-                               GDataEntry* entry) {
-  if (error == base::PLATFORM_FILE_OK)
-    *out = entry;
-}
-
-}  // namespace gdata