[sync] Reland - Replace FakeServer's implementation with LoopbackServer invocations.

components/sync/test/fake_server/tombstone_entity.cc

Index: components/sync/test/fake_server/tombstone_entity.cc
diff --git a/components/sync/test/fake_server/tombstone_entity.cc b/components/sync/test/fake_server/tombstone_entity.cc
deleted file mode 100644
index 014fca19311a4723c5d1698294577df6ca568e5a..0000000000000000000000000000000000000000
--- a/components/sync/test/fake_server/tombstone_entity.cc
+++ /dev/null
@@ -1,49 +0,0 @@
-// 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