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

pkg/stack_trace/test/frame_test.dart

 // Copyright (c) 2013, 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 frame_test;
 
 import 'dart:io';
-import 'dart:uri';
 
 import 'package:pathos/path.dart' as path;
 import 'package:stack_trace/src/utils.dart';
 import 'package:stack_trace/stack_trace.dart';
 import 'package:unittest/unittest.dart';
 
 String getStackFrame() {
   try {
     throw '';
   } catch (_, stackTrace) {
@@ skipping 16 matching lines @@
     expect(frame.line, equals(42));
     expect(frame.column, equals(21));
     expect(frame.member, equals('Foo._bar'));
   });
 
   test('parses a real stack frame correctly', () {
     var frame = new Frame.parse(getStackFrame());
     // TODO(nweiz): use URL-style paths when such a thing exists.
     var builder = new path.Builder(style: path.Style.posix);
     expect(builder.basename(frame.uri.path), equals('frame_test.dart'));
-    expect(frame.line, equals(17));
+    expect(frame.line, equals(16));
     expect(frame.column, equals(5));
     expect(frame.member, equals('getStackFrame'));
   });
 
   test('converts "<anonymous closure>" to "<fn>"', () {
     String parsedMember(String member) =>
         new Frame.parse('#0 $member (foo:0:0)').member;
 
     expect(parsedMember('Foo.<anonymous closure>'), equals('Foo.<fn>'));
     expect(parsedMember('<anonymous closure>.<anonymous closure>.bar'),
@@ skipping 111 matching lines @@
           equals('dart:core in Foo'));
     });
 
     test('converts "<anonymous closure>" to "<fn>"', () {
       expect(new Frame.parse('#0 Foo.<anonymous closure> (dart:core:5:10)')
               .toString(),
           equals('dart:core in Foo.<fn>'));
     });
   });
 }