LibWeb: Use WebIDL types for IDL exposed attributes

Author: https://github.com/kennethmyhra
Commit: 5b4644d198
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4596
Reviewed-by: https://github.com/shannonbooth ✅

Libraries/LibWeb/HTML/ImageData.cpp

@@ -143,12 +143,12 @@ void ImageData::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_data);
 }
 
-unsigned ImageData::width() const
+WebIDL::UnsignedLong ImageData::width() const
 {
     return m_bitmap->width();
 }
 
-unsigned ImageData::height() const
+WebIDL::UnsignedLong ImageData::height() const
 {
     return m_bitmap->height();
 }