Simplify runtime type support.

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 {
@@ skipping 295 matching lines @@
         name = "${enclosingClass.name.slowToString()}_"
                "${element.name.slowToString()}";
       } else {
         name = element.name.slowToString();
       }
     } else if (element.isLibrary()) {
       name = LIBRARY_PREFIX;
     } else {
       name = element.name.slowToString();
     }
-    // Prefix the name with '$' if it is reserved.
     return name;
   }
 
   String getBailoutName(Element element) {
     String name = bailoutNames[element];
     if (name != null) return name;
     bool global = !element.isInstanceMember();
     String unminifiedName = '${getName(element)}\$bailout';
     if (global) {
       name = getMappedGlobalName(unminifiedName);
@@ skipping 29 matching lines @@
         return setterName(element.getLibrary(), element.name);
       } else if (element.kind == ElementKind.FIELD) {
         return instanceFieldName(element.getLibrary(), element.name);
       } else {
         compiler.internalError('getName for bad kind: ${element.kind}',
                                node: element.parseNode(compiler));
       }
     } else {
       // Use declaration element to ensure invariant on [globals].
       element = element.declaration;
-
       // Dealing with a top-level or static element.
       String cached = globals[element];
       if (cached != null) return cached;
 
       String guess = _computeGuess(element);
       ElementKind kind = element.kind;
       if (identical(kind, ElementKind.VARIABLE) ||
           identical(kind, ElementKind.PARAMETER)) {
         // The name is not guaranteed to be unique.
         return safeName(guess);
@@ skipping 55 matching lines @@
   }
 
   String safeName(String name) {
     if (jsReserved.contains(name) || name.startsWith('\$')) {
       name = "\$$name";
       assert(!jsReserved.contains(name));
     }
     return name;
   }
 }