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

chrome/browser/sync/test/integration/single_client_bookmarks_sync_test.cc

Index: chrome/browser/sync/test/integration/single_client_bookmarks_sync_test.cc
diff --git a/chrome/browser/sync/test/integration/single_client_bookmarks_sync_test.cc b/chrome/browser/sync/test/integration/single_client_bookmarks_sync_test.cc
index 751b14bf9d6e3f250282695d2836c1d82a52698a..746f213ec9d71b8c914e70f1554a4b12bf4be5e7 100644
--- a/chrome/browser/sync/test/integration/single_client_bookmarks_sync_test.cc
+++ b/chrome/browser/sync/test/integration/single_client_bookmarks_sync_test.cc
@@ -16,6 +16,7 @@
 #include "components/sync/test/fake_server/bookmark_entity_builder.h"
 #include "components/sync/test/fake_server/entity_builder_factory.h"
 #include "components/sync/test/fake_server/fake_server_verifier.h"
+#include "components/sync/test/fake_server/tombstone_entity.h"
 #include "ui/base/layout.h"
 
 using bookmarks::BookmarkModel;
@@ -346,8 +347,8 @@
       GetFakeServer()->GetSyncEntitiesByModelType(syncer::BOOKMARKS);
   ASSERT_EQ(1ul, server_bookmarks.size());
   std::string entity_id = server_bookmarks[0].id_string();
-  std::unique_ptr<syncer::LoopbackServerEntity> tombstone(
-      syncer::PersistentTombstoneEntity::CreateNew(entity_id, std::string()));
+  std::unique_ptr<fake_server::FakeServerEntity> tombstone(
+      fake_server::TombstoneEntity::Create(entity_id, std::string()));
   GetFakeServer()->InjectEntity(std::move(tombstone));
 
   const syncer::ModelTypeSet kBookmarksType(syncer::BOOKMARKS);