Remove element from DynamicType.

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

 // Copyright (c) 2011, 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;
 
 /**
  * Assigns JavaScript identifiers to Dart variables, class-names and members.
  */
 class Namer implements ClosureNamer {
@@ skipping 707 matching lines @@
       if (selector.isGetter || selector.isSetter) root = '$root\$';
       return getMappedGlobalName(root, ensureSafe: false);
     } else {
       String suffix = getInterceptorSuffix(classes);
       return getMappedGlobalName("$root\$$suffix", ensureSafe: false);
     }
   }
 
   /// Returns the runtime name for [element].  The result is not safe as an id.
   String getRuntimeTypeName(Element element) {
-    if (identical(element, compiler.dynamicClass)) return 'dynamic';
+    if (element == null) return 'dynamic';
     return getNameForRti(element);
   }
 
   /**
    * Returns a preferred JS-id for the given element. The returned id is
    * guaranteed to be a valid JS-id. Globals and static fields are furthermore
    * guaranteed to be unique.
    *
    * For accessing statics consider calling [elementAccess] instead.
    */
@@ skipping 164 matching lines @@
   String getFunctionTypeName(FunctionType functionType) {
     return functionTypeNameMap.putIfAbsent(functionType, () {
       String proposedName = functionTypeNamer.computeName(functionType);
       String freshName = getFreshName(proposedName, usedInstanceNames,
                                       suggestedInstanceNames, ensureSafe: true);
       return freshName;
     });
   }
 
   String operatorIsType(DartType type) {
-    if (type.kind == TypeKind.FUNCTION) {
+    if (type.isFunctionType) {
       // TODO(erikcorry): Reduce from $isx to ix when we are minifying.
       return '${operatorIsPrefix()}_${getFunctionTypeName(type)}';
     }
     return operatorIs(type.element);
   }
 
   String operatorIs(Element element) {
     // TODO(erikcorry): Reduce from $isx to ix when we are minifying.
     return '${operatorIsPrefix()}${getRuntimeTypeName(element)}';
   }
@@ skipping 454 matching lines @@
         if (!first) {
           sb.write('_');
         }
         sb.write('_');
         visit(link.head);
         first = true;
       }
     }
   }
 }