remove generated_sdk from checked in code

test/generated_sdk/lib/internal/print.dart

-// Copyright (c) 2013, the Dart 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 file.
-
-part of dart._internal;
-
-/**
- * This function is set by the first allocation of a Zone.
- *
- * Once the function is set the core `print` function calls this closure instead
- * of [printToConsole].
- *
- * This decouples the core library from the async library.
- */
-Function printToZone = null;
-
-void printToConsole(String line) {
-  printString('$line');
-}