remove generated_sdk from checked in code

test/generated_sdk/lib/math/random.dart

-// Copyright (c) 2012, 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.math;
-
-/**
- * A generator of random bool, int, or double values.
- *
- * The default implementation supplies a stream of
- * pseudo-random bits that are not suitable for cryptographic purposes.
- */
-abstract class Random {
-  /**
-   * Creates a random-number generator. The optional parameter [seed] is used
-   * to initialize the internal state of the generator. The implementation of
-   * the random stream can change between releases of the library.
-   */
-  factory Random([int seed]) =>
-      (seed == null) ? const _JSRandom() : new _Random(seed);
-
-  /**
-   * Generates a positive random integer uniformly distributed on the range
-   * from 0, inclusive, to [max], exclusive.
-   *
-   * Implementation note: The default implementation supports [max] values
-   * between 1 and ((1<<32) - 1) inclusive.
-   */
-  int nextInt(int max);
-
-  /**
-   * Generates a positive random floating point value uniformly distributed on
-   * the range from 0.0, inclusive, to 1.0, exclusive.
-   */
-  double nextDouble();
-
-  /**
-   * Generates a random boolean value.
-   */
-  bool nextBool();
-}