Fix InterfaceType.treatAsRaw

pkg/compiler/lib/src/elements/types.dart

Index: pkg/compiler/lib/src/elements/types.dart
diff --git a/pkg/compiler/lib/src/elements/types.dart b/pkg/compiler/lib/src/elements/types.dart
index 6e84728e19da76f8102ac9f05b0203ba390667b4..26066158c931f5ba304eb9186fa18347536db482 100644
--- a/pkg/compiler/lib/src/elements/types.dart
+++ b/pkg/compiler/lib/src/elements/types.dart
@@ -115,6 +115,13 @@ class InterfaceType extends DartType {
     return this;
   }
 
+  bool get treatAsRaw {
+    for (DartType type in typeArguments) {
+      if (!type.treatAsDynamic) return false;
+    }
+    return true;
+  }
+
   @override
   R accept<R, A>(DartTypeVisitor visitor, A argument) =>
       visitor.visitInterfaceType(this, argument);