[element model] migrate use_full_hex_values_for_flutter_colors

Bug: https://github.com/dart-lang/linter/issues/5099
Change-Id: I1d1b29f36f56663ee06c1dffee78ac07bc0cd8e1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/390302
Auto-Submit: Phil Quitslund <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Commit-Queue: Brian Wilkerson <[email protected]>

Author: pq

pkg/linter/lib/src/extensions.dart

@@ -277,6 +277,19 @@ extension ConstructorElementExtension on ConstructorElement {
       name == constructorName;
 }
 
+extension ConstructorElementExtension2 on ConstructorElement2 {
+  /// Returns whether `this` is the same element as the [className] constructor
+  /// named [constructorName] declared in [uri].
+  bool isSameAs({
+    required String uri,
+    required String className,
+    required String constructorName,
+  }) =>
+      library2?.name == uri &&
+      enclosingElement2.name == className &&
+      name == constructorName;
+}
+
 extension DartTypeExtension on DartType? {
   bool extendsClass(String? className, String library) {
     var self = this;

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

@@ -40,7 +40,7 @@ class _Visitor extends SimpleAstVisitor<void> {
 
   @override
   void visitInstanceCreationExpression(InstanceCreationExpression node) {
-    var element = node.constructorName.staticElement;
+    var element = node.constructorName.element;
     if (element != null &&
         element.isSameAs(
             uri: 'dart.ui', className: 'Color', constructorName: '')) {