Change Link to List in FunctionSignature.

pkg/compiler/lib/src/mirrors/dart2js_mirrors.dart

Index: pkg/compiler/lib/src/mirrors/dart2js_mirrors.dart
diff --git a/pkg/compiler/lib/src/mirrors/dart2js_mirrors.dart b/pkg/compiler/lib/src/mirrors/dart2js_mirrors.dart
index 5aa71debeb7f74c3ee64e8ff0c09d3ee8f0bcad7..86c95ccf26d7278e7ca0574aab25ee5e021db4a0 100644
--- a/pkg/compiler/lib/src/mirrors/dart2js_mirrors.dart
+++ b/pkg/compiler/lib/src/mirrors/dart2js_mirrors.dart
@@ -44,19 +44,15 @@ List<ParameterMirror> _parametersFromFunctionSignature(
     Dart2JsDeclarationMirror owner,
     FunctionSignature signature) {
   var parameters = <ParameterMirror>[];
-  Link<Element> link = signature.requiredParameters;
-  while (!link.isEmpty) {
+  signature.requiredParameters.forEach((FormalElement parameter) {
     parameters.add(new Dart2JsParameterMirror(
-        owner, link.head, isOptional: false, isNamed: false));
-    link = link.tail;
-  }
-  link = signature.optionalParameters;
+        owner, parameter, isOptional: false, isNamed: false));
+  });
   bool isNamed = signature.optionalParametersAreNamed;
-  while (!link.isEmpty) {
+  signature.optionalParameters.forEach((FormalElement parameter) {
     parameters.add(new Dart2JsParameterMirror(
-        owner, link.head, isOptional: true, isNamed: isNamed));
-    link = link.tail;
-  }
+        owner, parameter, isOptional: true, isNamed: isNamed));
+  });
   return parameters;
 }