remove generated_sdk from checked in code

test/generated_sdk/lib/core/pattern.dart

-// Copyright (c) 2011, 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.core;
-
-/**
- * An interface for basic searches within strings.
- */
-abstract class Pattern {
-  // NOTE: When using "start" index from the language library, call
-  // without an argument if start is zero. This allows backwards compatiblity
-  // with implementations of the older interface that didn't have the start
-  // index argument.
-  /**
-   * Match this pattern against the string repeatedly.
-   *
-   * If [start] is provided, matching will start at that index.
-   *
-   * The iterable will contain all the non-overlapping matches of the
-   * pattern on the string, ordered by start index.
-   *
-   * The matches are found by repeatedly finding the first match
-   * of the pattern on the string, starting from the end of the previous
-   * match, and initially starting from index zero.
-   *
-   * If the pattern matches the empty string at some point, the next
-   * match is found by starting at the previous match's end plus one.
-   */
-  Iterable<Match> allMatches(String string, [int start = 0]);
-
-  /**
-   * Match this pattern against the start of `string`.
-   *
-   * If [start] is provided, it must be an integer in the range `0` ..
-   * `string.length`. In that case, this patten is tested against the
-   * string at the [start] position. That is, a [Match] is returned if the
-   * pattern can match a part of the string starting from position [start].
-   * Returns `null` if the pattern doesn't match.
-   */
-  Match matchAsPrefix(String string, [int start = 0]);
-}