Revert "Move dart:web to pkg:htmlescape."

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 57 matching lines @@
       implementation: true,
       documented: false,
       platforms: VM_PLATFORM),
 
   "uri": const LibraryInfo(
       "uri/uri.dart"),
 
   "utf": const LibraryInfo(
       "utf/utf.dart"),
 
+  "web": const LibraryInfo(
+      "web/web.dart"),
+
   "_js_helper": const LibraryInfo(
       "compiler/implementation/lib/js_helper.dart",
       category: "Internal",
       documented: false,
       platforms: DART2JS_PLATFORM),
 
   "_interceptors": const LibraryInfo(
       "compiler/implementation/lib/interceptors.dart",
       category: "Internal",
       documented: false,
@@ skipping 54 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;
 }