Add [OverrideBuiltins] to HTMLCollection IDL interface

Source/core/html/HTMLCollection.idl

Index: Source/core/html/HTMLCollection.idl
diff --git a/Source/core/html/HTMLCollection.idl b/Source/core/html/HTMLCollection.idl
index fb9b844d1332cf0118494d229bcd3fca86106a11..c013302f8792627bfd5e5b8324aabd7e44a3d7ed 100644
--- a/Source/core/html/HTMLCollection.idl
+++ b/Source/core/html/HTMLCollection.idl
@@ -22,6 +22,9 @@
     Custom=Wrap,
     DependentLifetime,
     SetWrapperReferenceFrom=ownerNode,
+    // FIXME(crbug.com/341192): OverrideBuiltins should be removed once the impact on
+    // performance becomes acceptable.
+    OverrideBuiltins
 ] interface HTMLCollection {
     readonly attribute unsigned long length;
     getter Element item([Default=Undefined] optional unsigned long index);