Remove service-compiler related code.

samples/todomvc/dart/presentation_graph.dart

-// Copyright (c) 2015, the Dartino project authors. Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE.md file.
-
-// Construction and transformation utilities.
-
-import 'todomvc_presenter_model.dart';
-
-Bool truth(bool value, [previous]) =>
-    (previous is Bool && previous.value == value) ? previous : new Bool(value);
-
-Str str(String value, [previous]) =>
-    (previous is Str && previous.value == value) ? previous : new Str(value);
-
-Nil nil([previous]) => (previous is Nil) ? previous : new Nil();
-
-Cons cons(fst, snd, [deleteEvent, completeEvent, uncompleteEvent, previous]) {
-  if (previous is Cons) {
-    bool equal = true;
-    if (fst == previous.fst) {
-      fst = previous.fst;
-    } else {
-      equal = false;
-    }
-    if (snd == previous.snd) {
-      snd = previous.snd;
-    } else {
-      equal = false;
-    }
-    if (deleteEvent == previous.deleteEvent) {
-      deleteEvent = previous.deleteEvent;
-    } else {
-      equal = false;
-    }
-    if (completeEvent == previous.completeEvent) {
-      completeEvent = previous.completeEvent;
-    } else {
-      equal = false;
-    }
-    if (uncompleteEvent == previous.uncompleteEvent) {
-      uncompleteEvent = previous.uncompleteEvent;
-    } else {
-      equal = false;
-    }
-    if (equal) {
-      return previous;
-    }
-  }
-  return new Cons(fst, snd, deleteEvent, completeEvent, uncompleteEvent);
-}
-
-Immutable getConsFst(Immutable node) => (node is Cons) ? node.fst : null;
-Immutable getConsSnd(Immutable node) => (node is Cons) ? node.snd : null;