Handle redirects to unresolved redirects

tests/compiler/dart2js/serialization/test_data.dart

Index: tests/compiler/dart2js/serialization/test_data.dart
diff --git a/tests/compiler/dart2js/serialization/test_data.dart b/tests/compiler/dart2js/serialization/test_data.dart
index 53312bbed30005c91e7f702dc95ac71cbdf8c7d0..19cebd991373d51833a078ce0f7bf07ccf3f13ff 100644
--- a/tests/compiler/dart2js/serialization/test_data.dart
+++ b/tests/compiler/dart2js/serialization/test_data.dart
@@ -110,7 +110,7 @@ main() {
   },
   expectedWarningCount: 1),
 
-  const Test('Impliment Comparable with incompatible parameter types', const {
+  const Test('Implement Comparable with incompatible parameter types', const {
     'main.dart': r'''
 class Class implements Comparable<Class> {
   int compareTo(String other) => 0;
@@ -122,7 +122,7 @@ main() {
   expectedWarningCount: 1,
   expectedInfoCount: 1),
 
-  const Test('Impliment Comparable with incompatible parameter count', const {
+  const Test('Implement Comparable with incompatible parameter count', const {
     'main.dart': r'''
 class Class implements Comparable {
   bool compareTo(a, b) => true;