Move ListImplementation from coreimpl to core, as a private member.

lib/compiler/implementation/lib/coreimpl_patch.dart

Index: lib/compiler/implementation/lib/coreimpl_patch.dart
diff --git a/lib/compiler/implementation/lib/coreimpl_patch.dart b/lib/compiler/implementation/lib/coreimpl_patch.dart
index a5aea079cd90176acaf1e42e2add4130a4b6d22a..79f1403792fdd67287b503cd939b6c6491e92bf3 100644
--- a/lib/compiler/implementation/lib/coreimpl_patch.dart
+++ b/lib/compiler/implementation/lib/coreimpl_patch.dart
@@ -53,22 +53,6 @@ patch class StringImplementation {
 }
 
 
-// Patch for List implementation.
-// TODO(ager): Split out into date_patch.dart and allow #source
-// in patch files?
-patch class ListImplementation<E> {
-  patch factory List([int length]) => Primitives.newList(length);
-
-  patch static List _from(Iterable other) {
-    List result = new List();
-    for (var element in other) {
-      result.add(element);
-    }
-    return result;
-  }
-}
-
-
 // Patch for RegExp implementation.
 // TODO(ager): Split out into regexp_patch.dart and allow #source in
 // patch files?