Merge CommonElements and BackendHelpers!

pkg/compiler/lib/src/js_emitter/startup_emitter/fragment_emitter.dart

 // Copyright (c) 2015, 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.startup_emitter.model_emitter;
 
 /// The name of the property that stores the tear-off getter on a static
 /// function.
 ///
 /// This property is only used when isolates are used.
@@ skipping 344 matching lines @@
 
 /// An expression that returns `true` if `__proto__` can be assigned to stitch
 /// together a prototype chain, and the performance is good.
 const String directAccessTestExpression = r'''
   (function () {
     var cls = function () {};
     cls.prototype = {'p': {}};
     var object = new cls();
     if (!(object.__proto__ && object.__proto__.p === cls.prototype.p))
       return false;
-    
+
     try {
       // Are we running on a platform where the performance is good?
       // (i.e. Chrome or d8).
 
       // Chrome userAgent?
       if (typeof navigator != "undefined" &&
           typeof navigator.userAgent == "string" &&
           navigator.userAgent.indexOf("Chrome/") >= 0) return true;
       // d8 version() looks like "N.N.N.N", jsshell version() like "N".
       if (typeof version == "function" &&
@@ skipping 85 matching lines @@
       Map<DeferredFragment, _DeferredFragmentHash> deferredLoadHashes) {
     MainFragment fragment = program.fragments.first;
 
     Iterable<Holder> nonStaticStateHolders =
         program.holders.where((Holder holder) => !holder.isStaticStateHolder);
 
     return js.js.statement(mainBoilerplate, {
       'directAccessTestExpression': js.js(directAccessTestExpression),
       'typeNameProperty': js.string(ModelEmitter.typeNameProperty),
       'cyclicThrow': backend.emitter
-          .staticFunctionAccess(backend.helpers.cyclicThrowHelper),
+          .staticFunctionAccess(compiler.commonElements.cyclicThrowHelper),
       'operatorIsPrefix': js.string(namer.operatorIsPrefix),
       'tearOffCode': new js.Block(buildTearOffCode(backend)),
       'embeddedTypes': generateEmbeddedGlobalAccess(TYPES),
       'embeddedInterceptorTags':
           generateEmbeddedGlobalAccess(INTERCEPTORS_BY_TAG),
       'embeddedLeafTags': generateEmbeddedGlobalAccess(LEAF_TAGS),
       'embeddedGlobalsObject': js.js("init"),
       'holdersList': new js.ArrayInitializer(nonStaticStateHolders
           .map((holder) => js.js("#", holder.name))
           .toList(growable: false)),
@@ skipping 910 matching lines @@
     }
     statements.add(js.js.statement("setOrUpdateInterceptorsByTag(#);",
         js.objectLiteral(interceptorsByTag)));
     statements.add(
         js.js.statement("setOrUpdateLeafTags(#);", js.objectLiteral(leafTags)));
     statements.addAll(subclassAssignments);
 
     return wrapPhase('nativeSupport', new js.Block(statements));
   }
 }