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

tests/compiler/dart2js/cpa_inference_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/scanner/scannerlib.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/source_file.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/types/types.dart';
 
 import "parser_helper.dart";
@@ skipping 153 matching lines @@
     void operator []=(int index, E value);
   }
   abstract class Map<K, V> {}
   class Closure {}
   class Null {}
   class Type {}
   class Dynamic_ {}
   bool identical(Object a, Object b) {}''';
 
 AnalysisResult analyze(String code, {int maxConcreteTypeSize: 1000}) {
-  Uri uri = new Uri.fromComponents(scheme: 'source');
+  Uri uri = new Uri(scheme: 'source');
   MockCompiler compiler = new MockCompiler(
       coreSource: CORELIB,
       enableConcreteTypeInference: true,
       maxConcreteTypeSize: maxConcreteTypeSize);
   compiler.sourceFiles[uri.toString()] = new SourceFile(uri.toString(), code);
   compiler.typesTask.concreteTypesInferrer.testMode = true;
   compiler.runCompiler(uri);
   return new AnalysisResult(compiler);
 }
 
@@ skipping 1214 matching lines @@
   testListWithCapacity();
   testEmptyList();
   testJsCall();
   testIsCheck();
   testSeenClasses();
   testGoodGuys();
   testIntDoubleNum();
   testConcreteTypeToTypeMask();
   testSelectors();
 }