Revert "Store library paths relative to a given application root folder."

pkg/kernel/lib/application_root.dart

-// Copyright (c) 2016, 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.
-library kernel.application_root;
-
-import 'package:path/path.dart' as pathlib;
-
-/// Resolves URIs with the `app` scheme.
-///
-/// These are used internally in kernel to represent file paths relative to
-/// some application root. This is done to avoid storing irrelevant paths, such
-/// as the path to the home directory of the user who compiled a given file.
-class ApplicationRoot {
-  static const String scheme = 'app';
-
-  final String path;
-
-  ApplicationRoot(this.path) {
-    assert(pathlib.isAbsolute(path));
-  }
-
-  /// Resolves a given file path or URI to a relative URI.
-  Uri resolve(String pathString) {
-    var uri = Uri.parse(pathString);
-    if (uri.hasScheme) return relativeUri(uri);
-    return new Uri(
-        scheme: ApplicationRoot.scheme,
-        path: pathlib.relative(uri.path, from: this.path));
-  }
-
-  /// Converts `app` URIs to absolute `file` URIs.
-  Uri absoluteUri(Uri uri) {
-    if (uri.scheme == ApplicationRoot.scheme) {
-      return new Uri(scheme: 'file', path: pathlib.join(this.path, uri.path));
-    } else {
-      return uri;
-    }
-  }
-
-  /// Converts `file` URIs to `app` URIs.
-  Uri relativeUri(Uri uri) {
-    if (uri.scheme == 'file') {
-      return new Uri(
-          scheme: ApplicationRoot.scheme,
-          path: pathlib.relative(uri.path, from: this.path));
-    } else {
-      return uri;
-    }
-  }
-}