Merge the dart:uri library into dart:core and update the Uri class

sdk/lib/uri/uri_sources.gypi

Index: sdk/lib/uri/uri_sources.gypi
diff --git a/sdk/lib/uri/uri_sources.gypi b/sdk/lib/uri/uri_sources.gypi
deleted file mode 100644
index 09f54fc8f28d6ad1b46e547f658b1e5c44ce6cb2..0000000000000000000000000000000000000000
--- a/sdk/lib/uri/uri_sources.gypi
+++ /dev/null
@@ -1,13 +0,0 @@
-# Copyright (c) 2012, 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.
-
-# This file contains all sources for the dart:uri library.
-{
-  'sources': [
-    'uri.dart',
-    # The above file needs to be first as it lists the parts below.
-    'helpers.dart',
-    'encode_decode.dart',
-  ],
-}