"Reverting 22561"

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

Index: tools/dom/templates/html/dart2js/html_dart2js.darttemplate
diff --git a/tools/dom/templates/html/dart2js/html_dart2js.darttemplate b/tools/dom/templates/html/dart2js/html_dart2js.darttemplate
index 9021a7d1c2a2eade86da497247e599e26bee596a..ef95ff298b01fa61e6f59f4ee5ee96839c08a010 100644
--- a/tools/dom/templates/html/dart2js/html_dart2js.darttemplate
+++ b/tools/dom/templates/html/dart2js/html_dart2js.darttemplate
@@ -11,13 +11,12 @@ library dart.dom.html;
 
 import 'dart:async';
 import 'dart:collection';
-import 'dart:_collection-dev' hide Symbol;
+import 'dart:_collection-dev';
 import 'dart:html_common';
 import 'dart:indexed_db';
 import 'dart:isolate';
 import 'dart:json' as json;
 import 'dart:math';
-import 'dart:mdv_observe_impl';
 import 'dart:typed_data';
 // Not actually used, but imported since dart:html can generate these objects.
 import 'dart:svg' as svg;
@@ -41,11 +40,10 @@ part '$AUXILIARY_DIR/KeyboardEventStream.dart';
 part '$AUXILIARY_DIR/KeyCode.dart';
 part '$AUXILIARY_DIR/KeyLocation.dart';
 part '$AUXILIARY_DIR/KeyName.dart';
-part '$AUXILIARY_DIR/PathObserver.dart';
+part '$AUXILIARY_DIR/ModelTreeObserver.dart';
 part '$AUXILIARY_DIR/Point.dart';
 part '$AUXILIARY_DIR/ReadyState.dart';
 part '$AUXILIARY_DIR/Rectangle.dart';
-part '$AUXILIARY_DIR/TemplateBindings.dart';
 part '$AUXILIARY_DIR/_HttpRequestUtils.dart';
 part '$AUXILIARY_DIR/Isolates.dart';
 part '$AUXILIARY_DIR/Microtask.dart';