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

content/browser/indexed_db/indexed_db_database_unittest.cc

Index: content/browser/indexed_db/indexed_db_database_unittest.cc
diff --git a/content/browser/indexed_db/indexed_db_database_unittest.cc b/content/browser/indexed_db/indexed_db_database_unittest.cc
index fe5ec45a12f42eede038450c05e4de1dc2e330fc..25244edf4147a906a959ea4fba0ae16e8156580f 100644
--- a/content/browser/indexed_db/indexed_db_database_unittest.cc
+++ b/content/browser/indexed_db/indexed_db_database_unittest.cc
@@ -158,16 +158,14 @@ class MockDeleteCallbacks : public IndexedDBCallbacks {
         blocked_called_(false),
         success_called_(false) {}
 
-  virtual void OnBlocked(int64 existing_version) override {
-    blocked_called_ = true;
-  }
-  virtual void OnSuccess(int64 result) override { success_called_ = true; }
+  void OnBlocked(int64 existing_version) override { blocked_called_ = true; }
+  void OnSuccess(int64 result) override { success_called_ = true; }
 
   bool blocked_called() const { return blocked_called_; }
   bool success_called() const { return success_called_; }
 
  private:
-  virtual ~MockDeleteCallbacks() {}
+  ~MockDeleteCallbacks() override {}
 
   bool blocked_called_;
   bool success_called_;