Standardize usage of virtual/override/final in sync/

sync/test/fake_server/bookmark_entity_builder.h

Index: sync/test/fake_server/bookmark_entity_builder.h
diff --git a/sync/test/fake_server/bookmark_entity_builder.h b/sync/test/fake_server/bookmark_entity_builder.h
index ebf66ff2b82274cdaa36623534dd8c3f4538672e..62c7169e6c59c78c507455def6615606aac8f8f8 100644
--- a/sync/test/fake_server/bookmark_entity_builder.h
+++ b/sync/test/fake_server/bookmark_entity_builder.h
@@ -23,10 +23,10 @@ class BookmarkEntityBuilder : public EntityBuilder {
                         const std::string& originator_cache_guid,
                         const std::string& originator_client_item_id);
 
-  virtual ~BookmarkEntityBuilder();
+  ~BookmarkEntityBuilder() override;
 
   // EntityBuilder
-  virtual scoped_ptr<FakeServerEntity> Build() override;
+  scoped_ptr<FakeServerEntity> Build() override;
 
  private:
   // The bookmark's URL.