Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/webdatabase/DatabaseManager.cpp

Index: Source/modules/webdatabase/DatabaseManager.cpp
diff --git a/Source/modules/webdatabase/DatabaseManager.cpp b/Source/modules/webdatabase/DatabaseManager.cpp
index c8ed236b30c3e4a4ac3a078260836eb92ce7683e..84e3d8789cce0e1283b43c9c013841f6bc2c7d8f 100644
--- a/Source/modules/webdatabase/DatabaseManager.cpp
+++ b/Source/modules/webdatabase/DatabaseManager.cpp
@@ -69,14 +69,14 @@ DatabaseManager::DatabaseManager()
     ASSERT(m_server); // We should always have a server to work with.
 }
 
-class DatabaseCreationCallbackTask : public ExecutionContextTask {
+class DatabaseCreationCallbackTask FINAL : public ExecutionContextTask {
 public:
     static PassOwnPtr<DatabaseCreationCallbackTask> create(PassRefPtr<Database> database, PassOwnPtr<DatabaseCallback> creationCallback)
     {
         return adoptPtr(new DatabaseCreationCallbackTask(database, creationCallback));
     }
 
-    virtual void performTask(ExecutionContext*)
+    virtual void performTask(ExecutionContext*) OVERRIDE
     {
         m_creationCallback->handleEvent(m_database.get());
     }