Re-apply "Fix URL decoding in HTTP library"

tests/standalone/io/http_date_test.dart

Index: tests/standalone/io/http_date_test.dart
diff --git a/tests/standalone/io/http_date_test.dart b/tests/standalone/io/http_date_test.dart
index 7833d79438436ea9f91bf91df2599c64ca372fa7..d2515e793fe0f380b0ca790e0a4d5149836e935a 100644
--- a/tests/standalone/io/http_date_test.dart
+++ b/tests/standalone/io/http_date_test.dart
@@ -2,14 +2,16 @@
 // 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.
 
+#source("../../../runtime/bin/input_stream.dart");
+#source("../../../runtime/bin/output_stream.dart");
+#source("../../../runtime/bin/chunked_stream.dart");
+#source("../../../runtime/bin/string_stream.dart");
+#source("../../../runtime/bin/stream_util.dart");
+#source("../../../runtime/bin/http.dart");
+#source("../../../runtime/bin/http_impl.dart");
+#source("../../../runtime/bin/http_parser.dart");
 #source("../../../runtime/bin/http_utils.dart");
 
-class HttpException implements Exception {
-  const HttpException([String this.message = ""]);
-  String toString() => "HttpException: $message";
-  final String message;
-}
-
 void testParseHttpDate() {
   TimeZone utc = new TimeZone.utc();
   Date date;