Remove obsolete http_base package

dart/pkg/http_base/lib/http_base_html.dart

-library http_base.http_base_html;
-
-import 'dart:html';
-import 'dart:async';
-import 'dart:convert';
-import 'dart:typed_data';
-
-import 'http_base.dart';
-export 'http_base.dart';
-
-/// The following headers will be blocked by browsers. See:
-/// http://www.w3.org/TR/XMLHttpRequest/
-const List<String> _BLOCKED_HEADERS = const [
-    'accept-charset', 'accept-encoding', 'access-control-request-headers',
-    'access-control-request-method', 'connection', 'content-length', 'cookie',
-    'cookie2', 'date', 'dnt', 'expect', 'host', 'keep-alive', 'origin',
-    'referer', 'te', 'trailer', 'transfer-encoding', 'upgrade', 'user-agent',
-    'via'];
-
-/// An implementation for [RequestHandler]. It uses dart:html to make http
-/// requests.
-class Client {
-  Future<Response> call(Request request) {
-    return _bufferData(request.read()).then((Uint8List data) {
-      var url = request.url.toString();
-      return _request(url, request.method, request.headers, data).then((xhr) {
-        var headers = HeadersImpl.Empty.replace(xhr.responseHeaders);
-        var body = _readResponse(xhr);
-        return new ResponseImpl(xhr.status, headers: headers, body: body);
-      });
-    });
-  }
-
-  Future<Uint8List> _bufferData(Stream<List<int>> stream) {
-    int size = 0;
-
-    return stream.fold([], (buffer, data) {
-      size += data.length;
-      return buffer..add(data);
-    }).then((List<List<int>> buffer) {
-      if (size > 0) {
-        var data;
-        if (buffer.length == 0 && buffer[0] is Uint8List) {
-          data = buffer[0];
-        } else {
-          data = new Uint8List(size);
-          int offset = 0;
-          for (var bytes in buffer) {
-            var end = offset + bytes.length;
-            data.setRange(offset, end, bytes);
-            offset = end;
-          }
-        }
-        return data;
-      }
-      return null;
-    });
-  }
-
-  Future<HttpRequest> _request(String url,
-                               String method,
-                               Headers headers,
-                               Uint8List sendData) {
-    var completer = new Completer<HttpRequest>();
-
-    var xhr = new HttpRequest();
-    xhr.open(method, url, async: true);
-
-    // Maybe we should use 'arraybuffer' instead?
-    xhr.responseType = 'blob';
-
-    // TODO: Special case Cookie/Set-Cookie here!
-    for (var name in headers.names) {
-      xhr.setRequestHeader(name, headers[name]);
-    }
-
-    xhr.onLoad.first.then((_) => completer.complete(xhr));
-    xhr.onError.first.then(completer.completeError);
-    xhr.send(sendData);
-
-    return completer.future;
-  }
-
-  Stream<List<int>> _readResponse(HttpRequest request) {
-    var controller = new StreamController<List<int>>();
-
-    var data = request.response;
-    assert (data is Blob);
-
-    var reader = new FileReader();
-    reader.onLoad.first.then((_) {
-      controller.add(reader.result);
-      controller.close();
-    });
-    reader.readAsArrayBuffer(data);
-
-    return controller.stream;
-  }
-}