fix sunflower -- dom types were not resolving

lib/runtime/dart_runtime.js

Index: lib/runtime/dart_runtime.js
diff --git a/lib/runtime/dart_runtime.js b/lib/runtime/dart_runtime.js
index 29105d48a2d76a341d49eba6f60cd2e074a81f14..db7522ed0acf2931015d487ad346ea524b5f7cd7 100644
--- a/lib/runtime/dart_runtime.js
+++ b/lib/runtime/dart_runtime.js
@@ -234,6 +234,8 @@ var dart, _js_helper;
     // 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;