Make generated Callback bindings classes FINAL

Source/bindings/templates/callback_interface.h

Index: Source/bindings/templates/callback_interface.h
diff --git a/Source/bindings/templates/callback_interface.h b/Source/bindings/templates/callback_interface.h
index acd58673bea4b5b2d1d81b7b924e6983129afd9e..6b32aaacd75067a89513d479836fc2ff55816287 100644
--- a/Source/bindings/templates/callback_interface.h
+++ b/Source/bindings/templates/callback_interface.h
@@ -44,7 +44,7 @@ namespace WebCore {
 
 class ExecutionContext;
 
-class {{v8_class}} : public {{cpp_class}}, public ActiveDOMCallback {
+class {{v8_class}} FINAL : public {{cpp_class}}, public ActiveDOMCallback {
 public:
     static PassOwnPtr<{{v8_class}}> create(v8::Handle<v8::Function> callback, ExecutionContext* context)
     {
@@ -55,7 +55,7 @@ public:
     virtual ~{{v8_class}}();
 
 {% for method in methods %}
-    virtual {{method.return_cpp_type}} {{method.name}}({{method.argument_declarations | join(', ')}});
+    virtual {{method.return_cpp_type}} {{method.name}}({{method.argument_declarations | join(', ')}}) OVERRIDE;
 {% endfor %}
 private:
     {{v8_class}}(v8::Handle<v8::Function>, ExecutionContext*);