[SyncFS] Migrate ServiceMetadata from MDDB to MDDBIndex.

chrome/browser/sync_file_system/drive_backend/drive_backend_test_util.cc

 // Copyright 2013 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/sync_file_system/drive_backend/drive_backend_test_util.h"
 
 #include <set>
 #include <string>
 
 #include "chrome/browser/drive/drive_api_util.h"
 #include "chrome/browser/sync_file_system/drive_backend/drive_backend_constants.h"
 #include "chrome/browser/sync_file_system/drive_backend/metadata_database.h"
 #include "chrome/browser/sync_file_system/drive_backend/metadata_database.pb.h"
 #include "google_apis/drive/drive_api_parser.h"
 #include "google_apis/drive/drive_entry_kinds.h"
 #include "google_apis/drive/gdata_wapi_parser.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace sync_file_system {
 namespace drive_backend {
 namespace test_util {
 
-void ExpectEquivalentServiceMetadata(const ServiceMetadata& left,
-                                     const ServiceMetadata& right) {
-  EXPECT_EQ(left.largest_change_id(), right.largest_change_id());
-  EXPECT_EQ(left.sync_root_tracker_id(), right.sync_root_tracker_id());
-  EXPECT_EQ(left.next_tracker_id(), right.next_tracker_id());
-}
-
 void ExpectEquivalentDetails(const FileDetails& left,
                              const FileDetails& right) {
   std::set<std::string> parents;
   for (int i = 0; i < left.parent_folder_ids_size(); ++i)
     EXPECT_TRUE(parents.insert(left.parent_folder_ids(i)).second);
 
   for (int i = 0; i < right.parent_folder_ids_size(); ++i)
     EXPECT_EQ(1u, parents.erase(left.parent_folder_ids(i)));
   EXPECT_TRUE(parents.empty());
 
@@ skipping 89 matching lines @@
   tracker->set_tracker_kind(TRACKER_KIND_REGULAR);
   tracker->set_dirty(true);
   tracker->set_active(false);
   tracker->set_needs_folder_listing(false);
   return tracker.Pass();
 }
 
 }  // namespace test_util
 }  // namespace drive_backend
 }  // namespace sync_file_system