LibJS+LibWeb: Wrap raw JS::Cell*/& fields in GCPtr/NonnullGCPtr

Author: https://github.com/mattco98
Commit: 7c0c1c8f49
Pull-request: https://github.com/SerenityOS/serenity/pull/17743
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibWeb/Layout/FormattingContext.cpp

@@ -321,7 +321,7 @@ CSSPixels FormattingContext::compute_auto_height_for_block_formatting_context_ro
     // In addition, if the element has any floating descendants
     // whose bottom margin edge is below the element's bottom content edge,
     // then the height is increased to include those edges.
-    for (auto* floating_box : m_state.get(root).floating_descendants()) {
+    for (auto floating_box : m_state.get(root).floating_descendants()) {
         // NOTE: Floating box coordinates are relative to their own containing block,
         //       which may or may not be the BFC root.
         auto margin_box = margin_box_rect_in_ancestor_coordinate_space(*floating_box, root, m_state);