Remove the http package from the repo.

pkg/http/lib/src/exception.dart

Index: pkg/http/lib/src/exception.dart
diff --git a/pkg/http/lib/src/exception.dart b/pkg/http/lib/src/exception.dart
deleted file mode 100644
index bb199d8c1741744b187e05753dbb92c3ba22597b..0000000000000000000000000000000000000000
--- a/pkg/http/lib/src/exception.dart
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright (c) 2014, 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 http.exception;
-
-/// An exception caused by an error in a pkg/http client.
-class ClientException implements Exception {
-  final String message;
-
-  /// The URL of the HTTP request or response that failed.
-  final Uri uri;
-
-  ClientException(this.message, [this.uri]);
-
-  String toString() => message;
-}