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

sdk/lib/_internal/compiler/implementation/apiimpl.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.
 
 library leg_apiimpl;
 
-import 'dart:uri';
 import 'dart:async';
 
 import '../compiler.dart' as api;
 import 'dart2jslib.dart' as leg;
 import 'tree/tree.dart' as tree;
 import 'elements/elements.dart' as elements;
 import 'ssa/tracer.dart' as ssa;
 import '../../libraries.dart';
 import 'source_file.dart';
 
@@ skipping 111 matching lines @@
     LibraryInfo info = LIBRARIES[dartLibraryName];
     if (info == null) return null;
     if (!info.isDart2jsLibrary) return null;
     String path = info.dart2jsPatchPath;
     if (path == null) return null;
     return "lib/$path";
   }
 
   elements.LibraryElement scanBuiltinLibrary(String path) {
     Uri uri = libraryRoot.resolve(lookupLibraryPath(path));
-    Uri canonicalUri = new Uri.fromComponents(scheme: "dart", path: path);
+    Uri canonicalUri = new Uri(scheme: "dart", path: path);
     elements.LibraryElement library =
         libraryLoader.loadLibrary(uri, null, canonicalUri);
     return library;
   }
 
   void log(message) {
     handler(null, null, null, message, api.Diagnostic.VERBOSE_INFO);
   }
 
   /// See [leg.Compiler.translateResolvedUri].
@@ skipping 132 matching lines @@
       handler(translateUri(span.uri, null), span.begin, span.end,
               message, kind);
     }
   }
 
   bool get isMockCompilation {
     return mockableLibraryUsed
       && (options.indexOf('--allow-mock-compilation') != -1);
   }
 }