fixes #231, mixin application (aka ClassTypeAlias) implicit ctors

lib/runtime/dart/collection.js

Index: lib/runtime/dart/collection.js
diff --git a/lib/runtime/dart/collection.js b/lib/runtime/dart/collection.js
index 99c068beb719c086f63f950ecdd48bf61159afb4..b127922a2dcde77248039cb5e212aa40852273c9 100644
--- a/lib/runtime/dart/collection.js
+++ b/lib/runtime/dart/collection.js
@@ -2321,7 +2321,11 @@ dart_library.library('dart/collection', null, /* Imports */[
   });
   let _UnmodifiableMapMixin = _UnmodifiableMapMixin$();
   let UnmodifiableMapBase$ = dart.generic(function(K, V) {
-    class UnmodifiableMapBase extends dart.mixin(MapBase$(K, V), _UnmodifiableMapMixin$(K, V)) {}
+    class UnmodifiableMapBase extends dart.mixin(MapBase$(K, V), _UnmodifiableMapMixin$(K, V)) {
+      UnmodifiableMapBase() {
+        super.MapBase(...arguments);
+      }
+    }
     return UnmodifiableMapBase;
   });
   let UnmodifiableMapBase = UnmodifiableMapBase$();
@@ -2474,7 +2478,11 @@ dart_library.library('dart/collection', null, /* Imports */[
   });
   let MapView = MapView$();
   let UnmodifiableMapView$ = dart.generic(function(K, V) {
-    class UnmodifiableMapView extends dart.mixin(MapView$(K, V), _UnmodifiableMapMixin$(K, V)) {}
+    class UnmodifiableMapView extends dart.mixin(MapView$(K, V), _UnmodifiableMapMixin$(K, V)) {
+      UnmodifiableMapView() {
+        super.MapView(...arguments);
+      }
+    }
     return UnmodifiableMapView;
   });
   let UnmodifiableMapView = UnmodifiableMapView$();