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

tests/compiler/dart2js/type_equals_test.dart

 // 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.
 
 import "package:expect/expect.dart";
 import '../../../sdk/lib/_internal/compiler/implementation/dart_types.dart';
 import "compiler_helper.dart";
 import "parser_helper.dart";
 
 bool test(compiler, String name1, String name2, {bool expect}) {
@@ skipping 32 matching lines @@
     type2 = signature2.requiredParameters.head.computeType(compiler);
   }
   if (expect) {
     Expect.equals(type1, type2, "$type1 != $type2");
   } else {
     Expect.notEquals(type1, type2, "$type1 == $type2");
   }
 }
 
 void main() {
-  var uri = new Uri.fromComponents(scheme: 'source');
+  var uri = new Uri(scheme: 'source');
   var compiler = compilerFor(
       r"""
       typedef int Typedef1<X,Y>(String s1);
       typedef void Typedef2<Z>(T t1, S s1);
 
       class Class<T,S> {
         void void1() {}
         void void2() {}
         void int1(int a) {}
         void int2(int b) {}
@@ skipping 43 matching lines @@
   test(compiler, "String1", "ListInt1", expect: false);
   test(compiler, "ListInt1", "ListString1", expect: false);
   test(compiler, "ListString1", "MapIntString1", expect: false);
   test(compiler, "MapIntString1", "TypeVar1", expect: false);
   test(compiler, "TypeVar1", "Function1a", expect: false);
   test(compiler, "Function1a", "Function1b", expect: false);
   test(compiler, "Function1b", "Typedef1a", expect: false);
   test(compiler, "Typedef1a", "Typedef1b", expect: false);
   test(compiler, "Typedef1b", "Typedef1c", expect: false);
 }