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

lib/compiler/implementation/lib/core_patch.dart

Index: lib/compiler/implementation/lib/core_patch.dart
diff --git a/lib/compiler/implementation/lib/core_patch.dart b/lib/compiler/implementation/lib/core_patch.dart
index d3f8e432c4dc6c1fa0f2b46a19af1b6bfe8ced43..31c94d74510e86b72be3baa6b33d59b46199bea1 100644
--- a/lib/compiler/implementation/lib/core_patch.dart
+++ b/lib/compiler/implementation/lib/core_patch.dart
@@ -148,3 +148,17 @@ patch class _StopwatchImpl {
   patch static int _frequency() => 1000;
   patch static int _now() => Primitives.dateNow();
 }
+
+
+// Patch for List implementation.
+patch class _ListImpl<E> {
+  patch factory List([int length]) => Primitives.newList(length);
+
+  patch factory List.from(Iterable<E> other) {
+    var result = new List();
+    for (var element in other) {
+      result.add(element);
+    }
+    return result;
+  }
+}