Fix the generic type of Map.values for map literals.

sdk/lib/_internal/lib/collection_patch.dart

Index: sdk/lib/_internal/lib/collection_patch.dart
diff --git a/sdk/lib/_internal/lib/collection_patch.dart b/sdk/lib/_internal/lib/collection_patch.dart
index e98bac663afff7b964e0016f3e9ff8b323ad2b58..feb40e62a295e960134543b90f3fc51e2f5b8a5f 100644
--- a/sdk/lib/_internal/lib/collection_patch.dart
+++ b/sdk/lib/_internal/lib/collection_patch.dart
@@ -71,7 +71,7 @@ class _HashMap<K, V> implements HashMap<K, V> {
   }
 
   Iterable<V> get values {
-    return keys.map((each) => this[each]);
+    return new MappedIterable<K, V>(keys, (each) => this[each]);
   }
 
   bool containsKey(Object key) {
@@ -527,7 +527,7 @@ class _LinkedHashMap<K, V> implements LinkedHashMap<K, V> {
   }
 
   Iterable<V> get values {
-    return keys.map((each) => this[each]);
+    return new MappedIterable<K, V>(keys, (each) => this[each]);
   }
 
   bool containsKey(Object key) {