Add FrontendStrategy.commonElements and remove Backend.commonElements

pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart b/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
index 9842a23a624a070d4c7e48082b0146bf045f1798..2b04fac5675d71fa22df5de283c7d69517c0ddb9 100644
--- a/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/lazy_emitter/model_emitter.dart
@@ -231,7 +231,7 @@ class ModelEmitter {
         'callName': js.string(namer.callNameField)
       }),
       'cyclicThrow': backend.emitter
-          .staticFunctionAccess(backend.commonElements.cyclicThrowHelper),
+          .staticFunctionAccess(_closedWorld.commonElements.cyclicThrowHelper),
       'outputContainsConstantList': program.outputContainsConstantList,
       'embeddedGlobals': emitEmbeddedGlobals(program),
       'readMetadataTypeFunction': readMetadataTypeFunction,