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

sdk/lib/_internal/libraries.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 libraries;
 
 /**
  * A bit flag used by [LibraryInfo] indicating that a library is used by dart2js
  */
 const int DART2JS_PLATFORM = 1;
@@ skipping 83 matching lines @@
 
   "typed_data": const LibraryInfo(
       "typed_data/typed_data.dart",
       dart2jsPath: "typed_data/dart2js/typed_data_dart2js.dart"),
 
   "svg": const LibraryInfo(
         "svg/dartium/svg_dartium.dart",
         category: "Client",
         dart2jsPath: "svg/dart2js/svg_dart2js.dart"),
 
-  "uri": const LibraryInfo(
-      "uri/uri.dart"),
-
   "utf": const LibraryInfo(
       "utf/utf.dart"),
 
   "web_audio": const LibraryInfo(
         "web_audio/dartium/web_audio_dartium.dart",
         category: "Client",
         dart2jsPath: "web_audio/dart2js/web_audio_dart2js.dart"),
 
   "web_gl": const LibraryInfo(
         "web_gl/dartium/web_gl_dartium.dart",
@@ skipping 92 matching lines @@
                     this.category: "Shared",
                     this.dart2jsPath,
                     this.dart2jsPatchPath,
                     this.implementation: false,
                     this.documented: true,
                     this.platforms: DART2JS_PLATFORM | VM_PLATFORM});
 
   bool get isDart2jsLibrary => (platforms & DART2JS_PLATFORM) != 0;
   bool get isVmLibrary => (platforms & VM_PLATFORM) != 0;
 }