Remove Compiler.commonElements

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

Index: pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart b/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
index 17a558a5c21a059846a85db55edb75061e29e559..06bf92ef4b36d8cf28e31d6b4cc551be2f9a21b9 100644
--- a/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/lazy_emitter/emitter.dart
@@ -36,17 +36,16 @@ class EmitterFactory implements emitterTask.EmitterFactory {
 
 class Emitter extends emitterTask.EmitterBase {
   final Compiler _compiler;
+  final ClosedWorld _closedWorld;
   final Namer namer;
   final ModelEmitter _emitter;
 
   JavaScriptBackend get _backend => _compiler.backend;
 
-  Emitter(Compiler compiler, Namer namer, NativeEmitter nativeEmitter,
-      ClosedWorld closedWorld, CodeEmitterTask task)
-      : this._compiler = compiler,
-        this.namer = namer,
-        _emitter =
-            new ModelEmitter(compiler, namer, nativeEmitter, closedWorld, task);
+  Emitter(this._compiler, this.namer, NativeEmitter nativeEmitter,
+      this._closedWorld, CodeEmitterTask task)
+      : _emitter = new ModelEmitter(
+            _compiler, namer, nativeEmitter, _closedWorld, task);
 
   DiagnosticReporter get reporter => _compiler.reporter;
 
@@ -126,7 +125,7 @@ class Emitter extends emitterTask.EmitterBase {
     switch (builtin) {
       case JsBuiltin.dartObjectConstructor:
         return js.js.expressionTemplateYielding(
-            typeAccess(_compiler.commonElements.objectClass));
+            typeAccess(_closedWorld.commonElements.objectClass));
 
       case JsBuiltin.isCheckPropertyToJsConstructorName:
         int isPrefixLength = namer.operatorIsPrefix.length;