Revert "dart2js cps: Add CharCodeAt builtin."

pkg/compiler/lib/src/common/names.dart

Index: pkg/compiler/lib/src/common/names.dart
diff --git a/pkg/compiler/lib/src/common/names.dart b/pkg/compiler/lib/src/common/names.dart
index 79389f5acab4afcb5697835d825d3f23d29a4c4a..657cc6fbe23438752d32f9d8e8a6f69d59949d9f 100644
--- a/pkg/compiler/lib/src/common/names.dart
+++ b/pkg/compiler/lib/src/common/names.dart
@@ -109,16 +109,13 @@ class Selectors {
 
   static final Selector length = new Selector.getter(Names.length);
 
-  static final Selector codeUnitAt =
-      new Selector.call(const PublicName('codeUnitAt'), CallStructure.ONE_ARG);
-
   /// List of all the selectors held in static fields.
   ///
   /// These objects are shared between different runs in batch-mode and must
   /// thus remain in the [Selector.canonicalizedValues] map.
   static final List<Selector> ALL = <Selector>[
       cancel, current, iterator, moveNext, noSuchMethod_, toString_,
-      hashCode_, compareTo, equals, length, codeUnitAt];
+      hashCode_, compareTo, equals, length];
 }
 
 /// [Uri]s commonly used.