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

components/sync/test/fake_server/bookmark_entity_builder.h

Index: components/sync/test/fake_server/bookmark_entity_builder.h
diff --git a/components/sync/test/fake_server/bookmark_entity_builder.h b/components/sync/test/fake_server/bookmark_entity_builder.h
index 10cb7844ceb409967e7028e53310ad59b7899c9b..b1c15861d723ba1145010a971efcd8e0c2664b56 100644
--- a/components/sync/test/fake_server/bookmark_entity_builder.h
+++ b/components/sync/test/fake_server/bookmark_entity_builder.h
@@ -9,7 +9,7 @@
 #include <string>
 
 #include "components/sync/base/model_type.h"
-#include "components/sync/engine_impl/loopback_server/loopback_server_entity.h"
+#include "components/sync/test/fake_server/fake_server_entity.h"
 #include "url/gurl.h"
 
 namespace fake_server {
@@ -29,22 +29,22 @@
   // the bookmark will be included in the bookmarks bar.
   void SetParentId(const std::string& parent_id);
 
-  // Builds and returns a LoopbackServerEntity representing a bookmark. Returns
-  // null if the entity could not be built.
-  std::unique_ptr<syncer::LoopbackServerEntity> BuildBookmark(const GURL& url);
+  // Builds and returns a FakeServerEntity representing a bookmark. Returns null
+  // if the entity could not be built.
+  std::unique_ptr<FakeServerEntity> BuildBookmark(const GURL& url);
 
-  // Builds and returns a LoopbackServerEntity representing a bookmark folder.
+  // Builds and returns a FakeServerEntity representing a bookmark folder.
   // Returns null if the entity could not be built.
-  std::unique_ptr<syncer::LoopbackServerEntity> BuildFolder();
+  std::unique_ptr<FakeServerEntity> BuildFolder();
 
  private:
   // Creates an EntitySpecifics and pre-populates its BookmarkSpecifics with
   // the entity's title.
   sync_pb::EntitySpecifics CreateBaseEntitySpecifics() const;
 
-  // Builds the parts of a LoopbackServerEntity common to both normal bookmarks
-  // and folders.
-  std::unique_ptr<syncer::LoopbackServerEntity> Build(
+  // Builds the parts of a FakeServerEntity common to both normal bookmarks and
+  // folders.
+  std::unique_ptr<FakeServerEntity> Build(
       const sync_pb::EntitySpecifics& entity_specifics,
       bool is_folder);