Simplify runtime type support.

sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart

 // Copyright (c) 2012, 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.
 
 part of js_backend;
 
 class ConstantEmitter implements ConstantVisitor {
   final Compiler compiler;
   final Namer namer;
 
@@ skipping 191 matching lines @@
     } else {
       SourceString helperSourceName =
           const SourceString('createRuntimeType');
       Element helper = compiler.findHelper(helperSourceName);
       JavaScriptBackend backend = compiler.backend;
       String helperName = backend.namer.getName(helper);
       DartType type = constant.representedType;
       Element element = type.element;
       String typeName;
       if (type.kind == TypeKind.INTERFACE) {
-        typeName = backend.rti.generateRuntimeTypeString(element, 0);
+        typeName =
+            backend.rti.getStringRepresentation(type, expandRawType: true);
       } else {
         assert(type.kind == TypeKind.TYPEDEF);
         typeName = element.name.slowToString();
       }
       buffer.add("${namer.CURRENT_ISOLATE}.$helperName('$typeName')");
     }
   }
 
   void visitConstructed(ConstructedConstant constant) {
     if (shouldEmitCanonicalVersion) {
       emitCanonicalVersion(constant);
     } else {
       shouldEmitCanonicalVersion = true;
 
       buffer.add("new ");
       buffer.add(getJsConstructor(constant.type.element));
       buffer.add("(");
       for (int i = 0; i < constant.fields.length; i++) {
         if (i != 0) buffer.add(", ");
         _visit(constant.fields[i]);
       }
       buffer.add(")");
     }
   }
 }