Revert "Dummy receiver optimization"

sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart b/sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart
index c436744568879d38f091b46fdfefd3bcd1cc82cb..c6ee2e53fac5049cff9b4bc3d69092659f26a327 100644
--- a/sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.dart
@@ -144,10 +144,6 @@ class ConstantReferenceEmitter implements ConstantVisitor<jsAst.Expression> {
   jsAst.Expression visitInterceptor(InterceptorConstant constant) {
     return emitCanonicalVersion(constant);
   }
-
-  jsAst.Expression visitDummyReceiver(DummyReceiverConstant constant) {
-    return new jsAst.LiteralNumber('0');
-  }
 }
 
 /**
@@ -317,10 +313,6 @@ class ConstantInitializerEmitter implements ConstantVisitor<jsAst.Expression> {
         'prototype');
   }
 
-  jsAst.Expression visitDummyReceiver(DummyReceiverConstant constant) {
-    return _reference(constant);
-  }
-
   jsAst.Expression visitConstructed(ConstructedConstant constant) {
     Element element = constant.type.element;
     if (element.isForeign(compiler)