Change TypeMask.base to be a ClassElement.

sdk/lib/_internal/compiler/implementation/js_backend/backend.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 JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked;
 
   JavaScriptItemCompilationContext()
@@ skipping 642 matching lines @@
         compiler.findHelper(const SourceString('JavaScriptIndexingBehavior'));
 
     specialOperatorEqClasses
         ..add(compiler.objectClass)
         ..add(jsInterceptorClass)
         ..add(jsNullClass);
 
     validateInterceptorImplementsAllObjectMethods(jsInterceptorClass);
 
     stringType = new HBoundedType(
-        new TypeMask.nonNullExact(jsStringClass.rawType));
+        new TypeMask.nonNullExact(jsStringClass));
     indexablePrimitiveType = new HBoundedType(
-        new TypeMask.nonNullSubtype(jsIndexableClass.rawType));
+        new TypeMask.nonNullSubtype(jsIndexableClass));
     readableArrayType = new HBoundedType(
-        new TypeMask.nonNullSubclass(jsArrayClass.rawType));
+        new TypeMask.nonNullSubclass(jsArrayClass));
     mutableArrayType = new HBoundedType(
-        new TypeMask.nonNullSubclass(jsMutableArrayClass.rawType));
+        new TypeMask.nonNullSubclass(jsMutableArrayClass));
     fixedArrayType = new HBoundedType(
-        new TypeMask.nonNullExact(jsFixedArrayClass.rawType));
+        new TypeMask.nonNullExact(jsFixedArrayClass));
     extendableArrayType = new HBoundedType(
-        new TypeMask.nonNullExact(jsExtendableArrayClass.rawType));
+        new TypeMask.nonNullExact(jsExtendableArrayClass));
   }
 
   void validateInterceptorImplementsAllObjectMethods(
       ClassElement interceptorClass) {
     if (interceptorClass == null) return;
     interceptorClass.ensureResolved(compiler);
     compiler.objectClass.forEachMember((_, Element member) {
       if (member.isGenerativeConstructor()) return;
       Element interceptorMember = interceptorClass.lookupMember(member.name);
       // Interceptors must override all Object methods due to calling convention
@@ skipping 1158 matching lines @@
     copy(constant.values);
     copy(constant.protoValue);
     copy(constant);
   }
 
   void visitConstructed(ConstructedConstant constant) {
     copy(constant.fields);
     copy(constant);
   }
 }