unfork DDC's copy of most SDK libraries

pkg/dev_compiler/tool/input_sdk/lib/core/symbol.dart

Index: pkg/dev_compiler/tool/input_sdk/lib/core/symbol.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/lib/core/symbol.dart b/pkg/dev_compiler/tool/input_sdk/lib/core/symbol.dart
deleted file mode 100644
index f60cdd145e9dbc15db66d1b6dd6a8d35b1a2e202..0000000000000000000000000000000000000000
--- a/pkg/dev_compiler/tool/input_sdk/lib/core/symbol.dart
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-// 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.core;
-
-/// Opaque name used by mirrors, invocations and [Function.apply].
-abstract class Symbol {
-  /**
-   * Constructs a new Symbol.
-   *
-   * The name must be a valid public Dart member name,
-   * public constructor name, or library name, optionally qualified.
-   *
-   * A qualified name is a valid name preceded by a public identifier name
-   * and a '`.`', e.g., `foo.bar.baz=` is a qualified version of `baz=`.
-   * That means that the content of the [name] String must be either
-   *
-   * * a valid public Dart identifier
-   *   (that is, an identifier not starting with "`_`"),
-   * * such an identifier followed by "=" (a setter name),
-   * * the name of a declarable operator
-   *   (one of "`+`", "`-`", "`*`", "`/`", "`%`", "`~/`", "`&`", "`|`",
-   *   "`^`", "`~`", "`<<`", "`>>`", "`<`", "`<=`", "`>`", "`>=`", "`==`",
-   *   "`[]`", "`[]=`", or "`unary-`"),
-   * * any of the above preceeded by any number of qualifiers,
-   *   where a qualifier is a non-private identifier followed by '`.`',
-   * * or the empty string (the default name of a library with no library
-   *   name declaration).
-   *
-   * The following text is non-normative:
-   *
-   * Creating non-const Symbol instances may result in larger output.  If
-   * possible, use [MirrorsUsed] in "dart:mirrors" to specify which names might
-   * be passed to this constructor.
-   */
-  const factory Symbol(String name) = internal.Symbol;
-
-  /**
-   * Returns a hash code compatible with [operator==].
-   *
-   * Equal symbols have the same hash code.
-   */
-  int get hashCode;
-
-  /**
-   * Symbols are equal to other symbols that correspond to the same member name.
-   *
-   * Qualified member names, like `#foo.bar` are equal only if they have the
-   * same identifiers before the same final member name.
-   */
-  bool operator ==(Object other);
-}