Merge CommonElements and BackendHelpers!

pkg/compiler/lib/src/js_emitter/full_emitter/interceptor_emitter.dart

 // Copyright (c) 2013, 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.
 
 library dart2js.js_emitter.full_emitter.interceptor_emitter;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
 import '../../elements/entities.dart';
 import '../../js/js.dart' as jsAst;
 import '../../js/js.dart' show js;
@@ skipping 31 matching lines @@
     List<jsAst.Statement> parts = <jsAst.Statement>[];
 
     parts.add(js.comment('getInterceptor methods'));
 
     Iterable<jsAst.Name> names =
         backend.oneShotInterceptorData.specializedGetInterceptorNames;
     for (jsAst.Name name in names) {
       Set<ClassEntity> classes =
           backend.oneShotInterceptorData.getSpecializedGetInterceptorsFor(name);
       parts.add(js.statement('#.# = #', [
-        namer.globalObjectForLibrary(backend.helpers.interceptorsLibrary),
+        namer
+            .globalObjectForLibrary(backend.commonElements.interceptorsLibrary),
         name,
         buildGetInterceptorMethod(name, classes)
       ]));
     }
 
     return new jsAst.Block(parts);
   }
 
   jsAst.Statement buildOneShotInterceptors() {
     List<jsAst.Statement> parts = <jsAst.Statement>[];
     Iterable<jsAst.Name> names =
         backend.oneShotInterceptorData.oneShotInterceptorNames;
 
     InterceptorStubGenerator stubGenerator =
         new InterceptorStubGenerator(compiler, namer, backend, closedWorld);
-    String globalObject =
-        namer.globalObjectForLibrary(backend.helpers.interceptorsLibrary);
+    String globalObject = namer
+        .globalObjectForLibrary(backend.commonElements.interceptorsLibrary);
     for (jsAst.Name name in names) {
       jsAst.Expression function =
           stubGenerator.generateOneShotInterceptor(name);
       parts.add(js.statement('${globalObject}.# = #', [name, function]));
     }
 
     return new jsAst.Block(parts);
   }
 
   /**
@@ skipping 25 matching lines @@
    */
   jsAst.Statement buildTypeToInterceptorMap(Program program) {
     jsAst.Expression array = program.typeToInterceptorMap;
     if (array == null) return js.comment("Empty type-to-interceptor map.");
 
     jsAst.Expression typeToInterceptorMap = emitter
         .generateEmbeddedGlobalAccess(embeddedNames.TYPE_TO_INTERCEPTOR_MAP);
     return js.statement('# = #', [typeToInterceptorMap, array]);
   }
 }