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

sdk/lib/_internal/compiler/implementation/deferred_load.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 deferred_load;
 
-import 'dart:uri'
-       show Uri;
-
 import 'dart:collection'
        show LinkedHashMap,
             LinkedHashSet;
 
 import 'dart2jslib.dart'
        show Compiler,
             CompilerTask,
             ConstructedConstant,
             MessageKind,
             SourceString,
@@ skipping 38 matching lines @@
 
   /// DeferredLibrary from dart:async
   ClassElement get deferredLibraryClass {
     if (cachedDeferredLibraryClass == null) {
       cachedDeferredLibraryClass = findDeferredLibraryClass();
     }
     return cachedDeferredLibraryClass;
   }
 
   ClassElement findDeferredLibraryClass() {
-    var uri = new Uri.fromComponents(scheme: 'dart', path: 'async');
+    var uri = new Uri(scheme: 'dart', path: 'async');
     LibraryElement asyncLibrary =
         compiler.libraryLoader.loadLibrary(uri, null, uri);
     var element = asyncLibrary.find(const SourceString('DeferredLibrary'));
     if (element == null) {
       compiler.internalErrorOnElement(
           asyncLibrary,
           'dart:async library does not contain required class: '
           'DeferredLibrary');
     }
     return element;
@@ skipping 180 matching lines @@
     TreeElements elements =
         compiler.enqueuer.resolution.getCachedElements(element);
     if (elements == null) return new LinkedHashSet<Element>();
     Node node = element.parseNode(compiler);
     var collector = new DependencyCollector(elements, compiler);
     node.accept(collector);
     collector.dependencies.addAll(elements.otherDependencies);
     return collector.dependencies;
   }
 }