Standardize usage of virtual/override/final in sync/

sync/test/fake_server/bookmark_entity.h

Index: sync/test/fake_server/bookmark_entity.h
diff --git a/sync/test/fake_server/bookmark_entity.h b/sync/test/fake_server/bookmark_entity.h
index 6161d1654100312d0aea8714272110a99ed20882..5cbbdb2b29c56f4b3eef8a6f78c5eb9282b303e5 100644
--- a/sync/test/fake_server/bookmark_entity.h
+++ b/sync/test/fake_server/bookmark_entity.h
@@ -19,7 +19,7 @@ namespace fake_server {
 // are non-deleted, client-created, and not unique per client account.
 class BookmarkEntity : public FakeServerEntity {
  public:
-  virtual ~BookmarkEntity();
+  ~BookmarkEntity() override;
 
   // Factory function for BookmarkEntity. This factory should be used only for
   // the first time that a specific bookmark is seen by the server.
@@ -49,10 +49,10 @@ class BookmarkEntity : public FakeServerEntity {
                  int64 last_modified_time);
 
   // FakeServerEntity implementation.
-  virtual std::string GetParentId() const override;
-  virtual void SerializeAsProto(sync_pb::SyncEntity* proto) override;
-  virtual bool IsDeleted() const override;
-  virtual bool IsFolder() const override;
+  std::string GetParentId() const override;
+  void SerializeAsProto(sync_pb::SyncEntity* proto) override;
+  bool IsDeleted() const override;
+  bool IsFolder() const override;
 
  private:
   // All member values have equivalent fields in SyncEntity.