Revert changes due to SDK reorganization. It's not clear to me whether we'll get

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 19 matching lines @@
       "coreimpl/coreimpl.dart",
       implementation: true,
       dart2jsPath: "compiler/implementation/lib/coreimpl.dart",
       dart2jsPatchPath: "compiler/implementation/lib/coreimpl_patch.dart"),
 
   "crypto": const LibraryInfo(
       "crypto/crypto.dart"),
 
   // dom/dom_frog.dart is a placeholder for dartium DOM.
   "dom_deprecated": const LibraryInfo(
-      "dom/dart2js/dom_dart2js.dart",
+      "dom/dom_dart2js.dart",
       implementation: true,
       dart2jsPath: "dom/dart2js/dom_dart2js.dart",
       documented: false),
 
   "html": const LibraryInfo(
-      "html/dartium/html_dartium.dart",
+      "html/html_dartium.dart",
       category: "Client",
       dart2jsPath: "html/dart2js/html_dart2js.dart"),
 
   "io": const LibraryInfo(
       "io/io_runtime.dart",
       category: "Server",
       dart2jsPath: "compiler/implementation/lib/io.dart"),
 
   "isolate": const LibraryInfo(
       "isolate/isolate.dart",
       dart2jsPatchPath: "compiler/implementation/lib/isolate_patch.dart"),
 
   "json": const LibraryInfo(
       "json/json.dart"),
 
   "math": const LibraryInfo(
       "math/math.dart",
       dart2jsPatchPath: "compiler/implementation/lib/math_patch.dart"),
 
   "mirrors": const LibraryInfo(
       "mirrors/mirrors.dart",
       documented: false,
       platforms: VM_PLATFORM),
 
   "nativewrappers": const LibraryInfo(
-      "html/dartium/nativewrappers.dart",
+      "html/nativewrappers.dart",
       category: "Client",
       implementation: true,
       documented: false,
       platforms: VM_PLATFORM),
 
   "uri": const LibraryInfo(
       "uri/uri.dart"),
 
   "utf": const LibraryInfo(
       "utf/utf.dart"),
@@ skipping 68 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;
 }