Move remaining helpers to BackendHelpers

pkg/compiler/lib/src/js_emitter/class_stub_generator.dart

 // Copyright (c) 2014, 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 dart2js.js_emitter;
 
 class ClassStubGenerator {
   final Namer namer;
   final Compiler compiler;
   final JavaScriptBackend backend;
@@ skipping 188 matching lines @@
 ///    Each function must have the `$callName` property set.
 ///   * `reflectionInfo`: contains reflective information, and the function
 ///    type. TODO(floitsch): point to where this is specified.
 ///   * `isStatic`.
 ///   * `name`.
 ///   * `isIntercepted.
 List<jsAst.Statement> buildTearOffCode(JavaScriptBackend backend) {
   Namer namer = backend.namer;
   Compiler compiler = backend.compiler;
 
-  Element closureFromTearOff = backend.findHelper('closureFromTearOff');
+  Element closureFromTearOff = backend.helpers.closureFromTearOff;
   jsAst.Expression tearOffAccessExpression;
   jsAst.Expression tearOffGlobalObjectString;
   jsAst.Expression tearOffGlobalObject;
   if (closureFromTearOff != null) {
     tearOffAccessExpression =
         backend.emitter.staticFunctionAccess(closureFromTearOff);
     tearOffGlobalObject =
         js.stringPart(namer.globalObjectFor(closureFromTearOff));
     tearOffGlobalObjectString =
         js.string(namer.globalObjectFor(closureFromTearOff));
@@ skipping 55 matching lines @@
           ? function() {
               if (cache === void 0) cache = #tearOff(
                   this, funcs, reflectionInfo, true, [], name).prototype;
               return cache;
             }
           : tearOffGetter(funcs, reflectionInfo, name, isIntercepted);
     }''',  {'tearOff': tearOffAccessExpression});
 
   return <jsAst.Statement>[tearOffGetter, tearOff];
 }