LibJS+LibWeb: Pass prototype to Object constructor

Everyone who constructs an Object must now pass a prototype object when
applicable. There's still a fair amount of code that passes something
fetched from the Interpreter, but this brings us closer to being able
to detach prototypes from Interpreter eventually.

Libraries/LibWeb/Bindings/CanvasRenderingContext2DWrapper.cpp

@@ -44,7 +44,8 @@ CanvasRenderingContext2DWrapper* wrap(JS::Heap& heap, CanvasRenderingContext2D&
 }
 
 CanvasRenderingContext2DWrapper::CanvasRenderingContext2DWrapper(CanvasRenderingContext2D& impl)
-    : m_impl(impl)
+    : Wrapper(*interpreter().object_prototype())
+    , m_impl(impl)
 {
     put_native_property("fillStyle", fill_style_getter, fill_style_setter);
     put_native_function("fillRect", fill_rect, 4);