Re-apply 'Unify dart:isolate.' with fixes for autogenerated dart2js and dartium html files.

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');
 
 /**
  * Mapping of "dart:" library name (e.g. "core") to information about that library.
  * This information is structured such that Dart Editor can parse this file
  * and extract the necessary information without executing it
@@ skipping 33 matching lines @@
       "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_compiler.dart",
-      dart2jsPath: "isolate/isolate_dart2js.dart"),
+      "isolate/isolate.dart"),
 
   "json": const LibraryInfo(
       "json/json.dart"),
 
   "math": const LibraryInfo(
       "math/math.dart",
       dart2jsPatchPath: "compiler/implementation/lib/math.dartp"),
 
   // Used by Dartium applications
   "nativewrappers": const LibraryInfo(
@@ skipping 66 matching lines @@
    * and that tools like Dart Editor should not show these libraries
    * in a list of all libraries unless the user specifically asks the tool to do so.
    * (e.g. "coreimpl" contains implementation for the "core" library).
    */
   final bool implementation;
 
   const LibraryInfo(this.path, [this.category = "Shared",
            this.dart2jsPath, this.dart2jsPatchPath,
            this.implementation = false, this.internal = false]);
 }