Change TypeMask.base to be a ClassElement.

sdk/lib/_internal/compiler/implementation/js_backend/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;
 
 /// Enables debugging of fast/slow objects using V8-specific primitives.
 const DEBUG_FAST_OBJECTS = false;
 
 /**
@@ skipping 2907 matching lines @@
     Map<String, Selector> addedJsNames = new Map<String, Selector>();
 
     void addNoSuchMethodHandlers(SourceString ignore, Set<Selector> selectors) {
       // Cache the object class and type.
       ClassElement objectClass = compiler.objectClass;
       DartType objectType = objectClass.computeType(compiler);
 
       for (Selector selector in selectors) {
         TypeMask mask = selector.mask;
         if (mask == null) {
-          mask = new TypeMask.subclass(compiler.objectClass.rawType);
+          mask = new TypeMask.subclass(compiler.objectClass);
         }
 
         if (!mask.needsNoSuchMethodHandling(selector, compiler)) continue;
         String jsName = namer.invocationMirrorInternalName(selector);
         addedJsNames[jsName] = selector;
         String reflectionName = getReflectionName(selector, jsName);
         if (reflectionName != null) {
           mangledFieldNames[jsName] = reflectionName;
         }
       }
@@ skipping 1428 matching lines @@
 
 const String HOOKS_API_USAGE = """
 // The code supports the following hooks:
 // dartPrint(message)   - if this function is defined it is called
 //                        instead of the Dart [print] method.
 // dartMainRunner(main) - if this function is defined, the Dart [main]
 //                        method will not be invoked directly.
 //                        Instead, a closure that will invoke [main] is
 //                        passed to [dartMainRunner].
 """;