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

sdk/lib/_internal/compiler/implementation/library_loader.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.
 
 part of dart2js;
 
 /**
  * [CompilerTask] for loading libraries and setting up the import/export scopes.
  *
  * The library loader uses four different kinds of URIs in different parts of
@@ skipping 319 matching lines @@
     }
   }
 
   bool isDartCore(Uri uri) => uri.scheme == "dart" && uri.path == "core";
 
   /**
    * Lazily loads and returns the [LibraryElement] for the dart:core library.
    */
   LibraryElement loadCoreLibrary(LibraryDependencyHandler handler) {
     if (compiler.coreLibrary == null) {
-      Uri coreUri = new Uri.fromComponents(scheme: 'dart', path: 'core');
+      Uri coreUri = new Uri(scheme: 'dart', path: 'core');
       compiler.coreLibrary
           = createLibrary(handler, null, coreUri, null, coreUri);
     }
     return compiler.coreLibrary;
   }
 
   void patchDartLibrary(LibraryDependencyHandler handler,
                         LibraryElement library, String dartLibraryPath) {
     if (library.isPatched) return;
     Uri patchUri = compiler.resolvePatchUri(dartLibraryPath);
@@ skipping 480 matching lines @@
   }
 
   /**
    * Registers all top-level entities of [library] as starting point for the
    * fixed-point computation of the import/export scopes.
    */
   void registerLibraryExports(LibraryElement library) {
     nodeMap[library].registerInitialExports();
   }
 }