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

tests/compiler/dart2js/patch_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/dart2jslib.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/elements/elements.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/tree/tree.dart";
 import "../../../sdk/lib/_internal/compiler/implementation/util/util.dart";
 import "mock_compiler.dart";
 import "parser_helper.dart";
-import "dart:uri";
 
 Compiler applyPatch(String script, String patch) {
   String core = "$DEFAULT_CORELIB\n$script";
   MockCompiler compiler = new MockCompiler(coreSource: core);
-  var uri = new Uri("core.dartp");
+  var uri = Uri.parse("core.dartp");
   compiler.sourceFiles[uri.toString()] = new MockFile(patch);
   var handler = new LibraryDependencyHandler(compiler);
   compiler.patchParser.patchLibrary(handler, uri, compiler.coreLibrary);
   handler.computeExports();
   return compiler;
 }
 
 void expectHasBody(compiler, Element element) {
     var node = element.parseNode(compiler);
     Expect.isNotNull(node, "Element isn't parseable, when a body was expected");
@@ skipping 711 matching lines @@
   testPatchNonExternalMember();
   testPatchNonClass();
   testPatchNonGetter();
   testPatchNoGetter();
   testPatchNonSetter();
   testPatchNoSetter();
   testPatchNonFunction();
 
   testPatchAndSelector();
 }