Revert of [sync] Replace FakeServer's implementation with LoopbackServer invocations.

components/sync/test/fake_server/tombstone_entity.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 "components/sync/test/fake_server/tombstone_entity.h"
+
+using std::string;
+using syncer::ModelType;
+
+namespace fake_server {
+
+TombstoneEntity::~TombstoneEntity() {}
+
+// static
+std::unique_ptr<FakeServerEntity> TombstoneEntity::Create(
+    const string& id,
+    const string& client_defined_unique_tag) {
+  const ModelType model_type = GetModelTypeFromId(id);
+  CHECK_NE(model_type, syncer::UNSPECIFIED) << "Invalid ID was given: " << id;
+  return std::unique_ptr<FakeServerEntity>(
+      new TombstoneEntity(id, client_defined_unique_tag, model_type));
+}
+
+TombstoneEntity::TombstoneEntity(const string& id,
+                                 const string& client_defined_unique_tag,
+                                 const ModelType& model_type)
+    : FakeServerEntity(id, client_defined_unique_tag, model_type, 0, string()) {
+  sync_pb::EntitySpecifics specifics;
+  AddDefaultFieldValue(model_type, &specifics);
+  SetSpecifics(specifics);
+}
+
+bool TombstoneEntity::RequiresParentId() const {
+  return false;
+}
+
+string TombstoneEntity::GetParentId() const {
+  return string();
+}
+
+void TombstoneEntity::SerializeAsProto(sync_pb::SyncEntity* proto) const {
+  FakeServerEntity::SerializeBaseProtoFields(proto);
+}
+
+bool TombstoneEntity::IsDeleted() const {
+  return true;
+}
+
+}  // namespace fake_server