Remove library_map.dart.

lib/compiler/implementation/library_map.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.
-
-// TODO(ahe): Long term, it would probably be better if we do not use
-// executable code to define the locations of libraries.
-
-#library('library_map');
-#import('../../../lib/_internal/libraries.dart', prefix: "libs");
-
-/**
- * Simple structure providing the path to a library and an optional path
- * to a patch file for the library.
- */
-class LibraryInfo {
-  final libs.LibraryInfo info;
-  const LibraryInfo(this.info);
-
-  String get libraryPath() {
-    String libPath = info.dart2jsPath;
-    if (libPath === null) libPath = info.path;
-    return "lib/$libPath";
-  }
-
-  String get patchPath() {
-    if (info.dart2jsPatchPath === null) return null;
-    return "lib/${info.dart2jsPatchPath}";
-  }
-
-  bool get isInternal => info.category === "Internal";
-}
-
-class Dart2JSLibraryMap {
-  const Dart2JSLibraryMap();
-
-  LibraryInfo operator[](String dartName) {
-    libs.LibraryInfo info = libs.LIBRARIES[dartName];
-    if (info === null) return null;
-    if (!info.isDart2JsLibrary()) {
-      // Dart2js can't handle internal libraries for other backends.
-      return null;
-    }
-    return new LibraryInfo(info);
-  }
-}
-
-final Dart2JSLibraryMap DART2JS_LIBRARY_MAP = const Dart2JSLibraryMap();