fix sunflower -- dom types were not resolving

lib/runtime/dart_runtime.js

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 var dart, _js_helper;
 (function (dart) {
   'use strict';
 
   let defineProperty = Object.defineProperty;
   let getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
@@ skipping 216 matching lines @@
     var desc = getOwnPropertyDescriptor(obj, name);
     if (desc) return desc.value;
   }
 
   function isClassSubType(t1, t2) {
     // We support Dart's covariant generics with the caveat that we do not
     // substitute bottom for dynamic in subtyping rules.
     // I.e., given T1, ..., Tn where at least one Ti != dynamic we disallow:
     // - S !<: S<T1, ..., Tn>
     // - S<dynamic, ..., dynamic> !<: S<T1, ..., Tn>
+    t1 = canonicalType(t1);
+    assert(t2 == canonicalType(t2));
     if (t1 == t2) return true;
 
     if (t1 == core.Object) return false;
 
     // If t1 is a JS Object, we may not hit core.Object.
     if (t1 == null) return t2 == core.Object || t2 == dart.dynamic;
 
     // Check if t1 and t2 have the same raw type.  If so, check covariance on
     // type parameters.
     let raw1 = safeGetOwnProperty(t1, dart.originalDeclaration);
@@ skipping 507 matching lines @@
   // TODO(vsm): How should we encode the runtime type?
   dart.runtimeType = Symbol('runtimeType');
 
   dart.JsSymbol = Symbol;
 
   // TODO(jmesserly): hack to bootstrap the SDK
   _js_helper = _js_helper || {};
   _js_helper.checkNum = notNull;
 
 })(dart || (dart = {}));