dart2js: Move field-visiting code to the program-builder.

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

Index: pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
diff --git a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
index 7d77bf3ce5bd9ff388b8794f5325846f0884baa2..b3d7bc95454f487095bbfa1a54fea7b428ab02d6 100644
--- a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
+++ b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
@@ -133,7 +133,7 @@ class CodeEmitterTask extends CompilerTask {
 
       Set<ClassElement> rtiNeededClasses = _finalizeRti();
       ProgramBuilder programBuilder = new ProgramBuilder(
-          compiler, namer, this, emitter, oldEmitter, rtiNeededClasses);
+          compiler, namer, this, emitter, rtiNeededClasses);
       int size = emitter.emitProgram(programBuilder);
       // TODO(floitsch): we shouldn't need the `neededClasses` anymore.
       neededClasses = programBuilder.collector.neededClasses;