remove generated_sdk from checked in code

test/generated_sdk/lib/collection/linked_hash_set.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.collection;
-
-/**
- * A [LinkedHashSet] is a hash-table based [Set] implementation.
- *
- * The `LinkedHashSet` also keep track of the order that elements were inserted
- * in, and iteration happens in first-to-last insertion order.
- *
- * The elements of a `LinkedHashSet` must have consistent [Object.operator==]
- * and [Object.hashCode] implementations. This means that the `==` operator
- * must define a stable equivalence relation on the elements (reflexive,
- * symmetric, transitive, and consistent over time), and that `hashCode`
- * must be the same for objects that are considered equal by `==`.
- *
- * The set allows `null` as an element.
- *
- * Iteration of elements is done in element insertion order.
- * An element that was added after another will occur later in the iteration.
- * Adding an element that is already in the set
- * does not change its position in the iteration order,
- * but removing an element and adding it again,
- * will make it the last element of an iteration.
- *
- * Most simple operations on `HashSet` are done in (potentially amortized)
- * constant time: [add], [contains], [remove], and [length], provided the hash
- * codes of objects are well distributed..
- */
-abstract class LinkedHashSet<E> implements HashSet<E> {
-  /**
-   * Create an insertion-ordered hash set using the provided
-   * [equals] and [hashCode].
-   *
-   * The provided [equals] must define a stable equivalence relation, and
-   * [hashCode] must be consistent with [equals]. If the [equals] or [hashCode]
-   * methods won't work on all objects, but only to instances of E, the
-   * [isValidKey] predicate can be used to restrict the keys that they are
-   * applied to. Any key for which [isValidKey] returns false is automatically
-   * assumed to not be in the set.
-   *
-   * If [equals] or [hashCode] are omitted, the set uses
-   * the objects' intrinsic [Object.operator==] and [Object.hashCode],
-   *
-   * If [isValidKey] is omitted, it defaults to testing if the object is an
-   * [E] instance.
-   *
-   * If you supply one of [equals] and [hashCode],
-   * you should generally also to supply the other.
-   * An example would be using [identical] and [identityHashCode],
-   * which is equivalent to using the shorthand [LinkedSet.identity]).
-   */
-  factory LinkedHashSet({ bool equals(E e1, E e2),
-                          int hashCode(E e),
-                          bool isValidKey(Object potentialKey) }) {
-    if (isValidKey == null) {
-      if (hashCode == null) {
-        if (equals == null) {
-          return new _LinkedHashSet<E>();
-        }
-        hashCode = _defaultHashCode;
-      } else {
-        if (identical(identityHashCode, hashCode) &&
-            identical(identical, equals)) {
-          return new _LinkedIdentityHashSet<E>();
-        }
-        if (equals == null) {
-          equals = _defaultEquals;
-        }
-      }
-    } else {
-      if (hashCode == null) {
-        hashCode = _defaultHashCode;
-      }
-      if (equals == null) {
-        equals = _defaultEquals;
-      }
-    }
-    return new _LinkedCustomHashSet<E>(equals, hashCode, isValidKey);
-  }
-
-  /**
-   * Creates an insertion-ordered identity-based set.
-   *
-   * Effectively a shorthand for:
-   *
-   *     new LinkedHashSet(equals: identical, hashCode: identityHashCodeOf)
-   */
-  factory LinkedHashSet.identity() = _LinkedIdentityHashSet<E>;
-
-  /**
-   * Create a linked hash set containing all [elements].
-   *
-   * Creates a linked hash set as by `new LinkedHashSet<E>()` and adds each
-   * element of`elements` to this set in the order they are iterated.
-   *
-   * All the [elements] should be assignable to [E].
-   * The `elements` iterable itself may have any element type,
-   * so this constructor can be used to down-cast a `Set`, for example as:
-   *
-   *     Set<SuperType> superSet = ...;
-   *     Iterable<SuperType> tmp = superSet.where((e) => e is SubType);
-   *     Set<SubType> subSet = new LinkedHashSet<SubType>.from(tmp);
-   */
-  factory LinkedHashSet.from(Iterable<E> elements) {
-    LinkedHashSet<E> result = new LinkedHashSet<E>();
-    for (final E element in elements) {
-      result.add(element);
-    }
-    return result;
-  }
-
-  /**
-   * Executes a function on each element of the set.
-   *
-   * The elements are iterated in insertion order.
-   */
-  void forEach(void action(E element));
-
-  /**
-   * Provides an iterator that iterates over the elements in insertion order.
-   */
-  Iterator<E> get iterator;
-}