Standardize usage of virtual/override/final in content/browser/

content/browser/indexed_db/mock_indexed_db_database_callbacks.h

Index: content/browser/indexed_db/mock_indexed_db_database_callbacks.h
diff --git a/content/browser/indexed_db/mock_indexed_db_database_callbacks.h b/content/browser/indexed_db/mock_indexed_db_database_callbacks.h
index b38542b3fdf1a69087e4cb14dadb2aac2a230ecf..31a29645a25c33d1cbfdf5846fc4fb4c4656133a 100644
--- a/content/browser/indexed_db/mock_indexed_db_database_callbacks.h
+++ b/content/browser/indexed_db/mock_indexed_db_database_callbacks.h
@@ -14,17 +14,17 @@ class MockIndexedDBDatabaseCallbacks : public IndexedDBDatabaseCallbacks {
  public:
   MockIndexedDBDatabaseCallbacks();
 
-  virtual void OnVersionChange(int64 old_version, int64 new_version) override {}
-  virtual void OnForcedClose() override;
-  virtual void OnAbort(int64 transaction_id,
-                       const IndexedDBDatabaseError& error) override;
-  virtual void OnComplete(int64 transaction_id) override {}
+  void OnVersionChange(int64 old_version, int64 new_version) override {}
+  void OnForcedClose() override;
+  void OnAbort(int64 transaction_id,
+               const IndexedDBDatabaseError& error) override;
+  void OnComplete(int64 transaction_id) override {}
 
   bool abort_called() const { return abort_called_; }
   bool forced_close_called() const { return forced_close_called_; }
 
  private:
-  virtual ~MockIndexedDBDatabaseCallbacks() {}
+  ~MockIndexedDBDatabaseCallbacks() override {}
 
   bool abort_called_;
   bool forced_close_called_;