Remove Resource class and support functions.

runtime/lib/resource_patch.dart

-// Copyright (c) 2015, 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.
-
-patch class Resource {
-  /* patch */ const factory Resource(String uri) = _Resource;
-}
-
-class _Resource implements Resource {
-  final String _location;
-
-  const _Resource(this._location);
-
-  Uri get uri => Uri.base.resolve(_location);
-
-  Stream<List<int>> openRead() {
-    if (VMLibraryHooks.resourceReadAsBytes == null) {
-      throw new UnimplementedError("openRead");
-    }
-
-    var controller = new StreamController<List<int>>();
-    // We only need to implement the listener as there is no way to provide
-    // back pressure into the channel.
-    controller.onListen = () {
-      // Once there is a listener, we kick off the loading of the resource.
-      readAsBytes().then((value) {
-        // The resource loading implementation sends all of the data in a
-        // single message. So the stream will only get a single value posted.
-        controller.add(value);
-        controller.close();
-      },
-      onError: (e, s) {
-        // In case the future terminates with an error we propagate it to the
-        // stream.
-        controller.addError(e, s);
-        controller.close();
-      });
-    };
-
-    return controller.stream;
-  }
-
-  Future<List<int>> readAsBytes() {
-    if (VMLibraryHooks.resourceReadAsBytes == null) {
-      throw new UnimplementedError("readAsBytes");
-    }
-
-    return VMLibraryHooks.resourceReadAsBytes(this.uri);
-  }
-
-  Future<String> readAsString({Encoding encoding : UTF8}) {
-    if (VMLibraryHooks.resourceReadAsBytes == null) {
-      throw new UnimplementedError("readAsString");
-    }
-
-    var completer = new Completer<String>();
-
-    readAsBytes().then((bytes) {
-      var str = encoding.decode(bytes);
-      completer.complete(str);
-    },
-    onError: (e, s) {
-      completer.completeError(e,s);
-    });
-
-    return completer.future;
-  }
-}