Merge CoreTypes and CoreClasses into CommonElements.

pkg/compiler/lib/src/constants/evaluation.dart

Index: pkg/compiler/lib/src/constants/evaluation.dart
diff --git a/pkg/compiler/lib/src/constants/evaluation.dart b/pkg/compiler/lib/src/constants/evaluation.dart
index 88aad8abd5a3bdae67a99ff6e9b1062e01d3470c..5b2428b04ec3c89dfd80fae2ec21a6f1802b07f6 100644
--- a/pkg/compiler/lib/src/constants/evaluation.dart
+++ b/pkg/compiler/lib/src/constants/evaluation.dart
@@ -10,7 +10,8 @@ import 'expressions.dart';
 
 /// Environment used for evaluating constant expressions.
 abstract class Environment {
-  // TODO(johnniwinther): Replace this with [CoreTypes] and maybe [Backend].
+  // TODO(johnniwinther): Replace this with [CommonElements] and maybe
+  // [Backend].
   Compiler get compiler;
 
   /// Read environments string passed in using the '-Dname=value' option.