[SyncFS] Drop test only un-thread-safe getters from SyncEngine (4)

chrome/browser/sync_file_system/drive_backend/drive_backend_sync_unittest.cc

 // 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 <algorithm>
 #include <stack>
 
 #include "base/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 543 matching lines @@
         base::Bind(&MetadataDatabase::CountFileTracker,
                    base::Unretained(metadata_database())),
         base::Bind(&SetValueAndCallClosure<size_t>,
                    run_loop.QuitClosure(), &count));
     run_loop.Run();
     return count;
   }
 
   drive::FakeDriveService* fake_drive_service() {
     return static_cast<drive::FakeDriveService*>(
-        remote_sync_service_->GetDriveService());
+        remote_sync_service_->drive_service_.get());
   }
 
   FakeDriveServiceHelper* fake_drive_service_helper() {
     return fake_drive_service_helper_.get();
   }
 
  private:
   // MetadataDatabase is normally used on the worker thread.
   // Use this only when there is no task running on the worker.
   MetadataDatabase* metadata_database() {
@@ skipping 1103 matching lines @@
 
   EXPECT_EQ(1u, CountApp());
   EXPECT_EQ(1u, CountLocalFile(app_id));
 
   EXPECT_EQ(2u, CountMetadata());
   EXPECT_EQ(2u, CountTracker());
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system