[element model] migrate prefer_constructors_over_static_methods

Bug: https://github.com/dart-lang/linter/issues/5099
Change-Id: I8b165b87ac6159d3df2a7cd7f0a804b619c7eeb6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/390022
Commit-Queue: Phil Quitslund <[email protected]>
Auto-Submit: Phil Quitslund <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: pq

pkg/linter/lib/src/rules/prefer_constructors_over_static_methods.dart

@@ -80,10 +80,12 @@ class _Visitor extends SimpleAstVisitor<void> {
 
 extension on AstNode? {
   InterfaceType? typeToCheckOrNull() => switch (this) {
-        ExtensionTypeDeclaration e =>
-          e.typeParameters == null ? e.declaredElement?.thisType : null,
-        ClassDeclaration c =>
-          c.typeParameters == null ? c.declaredElement?.thisType : null,
+        ExtensionTypeDeclaration e => e.typeParameters == null
+            ? e.declaredFragment?.element.thisType
+            : null,
+        ClassDeclaration c => c.typeParameters == null
+            ? c.declaredFragment?.element.thisType
+            : null,
         _ => null
       };
 }