Revert "Add some support for the code-point code-unit distinction."

sdk/lib/_internal/compiler/implementation/lib/core_patch.dart

Index: sdk/lib/_internal/compiler/implementation/lib/core_patch.dart
diff --git a/sdk/lib/_internal/compiler/implementation/lib/core_patch.dart b/sdk/lib/_internal/compiler/implementation/lib/core_patch.dart
index cd2d34ade827b4d986efea7343cd2de10c0d43ee..5c6cb3bbe6ee7f8a38ba7532fc3d4730c0287a00 100644
--- a/sdk/lib/_internal/compiler/implementation/lib/core_patch.dart
+++ b/sdk/lib/_internal/compiler/implementation/lib/core_patch.dart
@@ -168,12 +168,12 @@ patch class _ListImpl<E> {
 
 
 patch class String {
-  patch factory String.fromCodeUnits(List<int> codeUnits) {
-    if (!isJsArray(codeUnits)) {
-      if (codeUnits is !List) throw new ArgumentError(codeUnits);
-      codeUnits = new List.from(codeUnits);
+  patch factory String.fromCharCodes(List<int> charCodes) {
+    if (!isJsArray(charCodes)) {
+      if (charCodes is !List) throw new ArgumentError(charCodes);
+      charCodes = new List.from(charCodes);
     }
-    return Primitives.stringFromCodeUnits(codeUnits);
+    return Primitives.stringFromCharCodes(charCodes);
   }
 }