mac: Prepare most test code for -Wunused-functions too.

chrome/browser/sync_file_system/drive_backend/metadata_database_unittest.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/metadata_database.h"
 
 #include "base/bind.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 35 matching lines @@
   bool tracker_only;
 
   TrackedFile() : should_be_absent(false), tracker_only(false) {}
 };
 
 void ExpectEquivalent(const ServiceMetadata* left,
                       const ServiceMetadata* right) {
   test_util::ExpectEquivalentServiceMetadata(*left, *right);
 }
 
-void ExpectEquivalent(const FileDetails* left, const FileDetails* right) {
-  if (!left) {
-    ASSERT_FALSE(right);
-    return;
-  }
-  ASSERT_TRUE(right);
-  test_util::ExpectEquivalentDetails(*left, *right);
-}
-
 void ExpectEquivalent(const FileMetadata* left, const FileMetadata* right) {
   if (!left) {
     ASSERT_FALSE(right);
     return;
   }
   ASSERT_TRUE(right);
   test_util::ExpectEquivalentMetadata(*left, *right);
 }
 
 void ExpectEquivalent(const FileTracker* left, const FileTracker* right) {
@@ skipping 898 matching lines @@
   ResetTrackerID(&sync_root.tracker);
   ResetTrackerID(&app_root.tracker);
   app_root.tracker.set_parent_tracker_id(sync_root.tracker.tracker_id());
 
   VerifyTrackedFiles(tracked_files, arraysize(tracked_files));
   VerifyReloadConsistency();
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system