Revert "Rename internal library dart:_collection-dev to dart:_internal."

tools/dom/templates/html/dart2js/html_dart2js.darttemplate

 // 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.
 
 // DO NOT EDIT - unless you are editing documentation as per:
 // https://code.google.com/p/dart/wiki/ContributingHTMLDocumentation
 // Auto-generated dart:html library.
 
 /**
  * HTML elements and other resources for web-based applications that need to
@@ skipping 16 matching lines @@
  * and run its built-in examples.
  *
  * * For even more examples, see
  * [Dart HTML5 Samples](https://github.com/dart-lang/dart-html5-samples)
  * on Github.
  */
 library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
-import 'dart:_collection-dev' hide Symbol, deprecated;
+import 'dart:_internal' hide Symbol, deprecated;
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import "dart:convert";
 import 'dart:math';
 import 'dart:typed_data';
 // Not actually used, but imported since dart:html can generate these objects.
 import 'dart:svg' as svg;
 import 'dart:svg' show Matrix;
 import 'dart:web_audio' as web_audio;
@@ skipping 75 matching lines @@
    *
    * This can only be called by subclasses from their created constructor.
    */
   HtmlElement.created() : super.created();
 }
 
 // EntryArray type was removed, so explicitly adding it to allow support for
 // older Chrome versions.
 // Issue #12573.
 abstract class _EntryArray implements List<Entry> native "EntryArray" {}