Access ConstantSystem through ClosedWorld.

pkg/compiler/lib/src/inferrer/inferrer_visitor.dart

Index: pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
diff --git a/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart b/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
index e83746345a0439110f5868a48fc8ba9e8b9b4bf3..ef9fbfac4d57507f11cfc535c68ff65eb4922f1a 100644
--- a/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
+++ b/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
@@ -861,16 +861,16 @@ abstract class InferrerVisitor<T, E extends MinimalInferrerEngine<T>>
     ConstantSystem constantSystem = compiler.backend.constantSystem;
     // The JavaScript backend may turn this literal into an integer at
     // runtime.
-    return types.getConcreteTypeFor(computeTypeMask(closedWorld,
-        compiler.backend, constantSystem.createDouble(node.value)));
+    return types.getConcreteTypeFor(
+        computeTypeMask(closedWorld, constantSystem.createDouble(node.value)));
   }
 
   T visitLiteralInt(LiteralInt node) {
     ConstantSystem constantSystem = compiler.backend.constantSystem;
     // The JavaScript backend may turn this literal into a double at
     // runtime.
-    return types.getConcreteTypeFor(computeTypeMask(
-        closedWorld, compiler.backend, constantSystem.createInt(node.value)));
+    return types.getConcreteTypeFor(
+        computeTypeMask(closedWorld, constantSystem.createInt(node.value)));
   }
 
   T visitLiteralList(LiteralList node) {