Ignore non-content divs in htmlToText.

dart/site/try/src/interaction_manager.dart

 // Copyright (c) 2014, 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 trydart.interaction_manager;
 
 import 'dart:html';
 
 import 'dart:convert' show
     JSON;
@@ skipping 309 matching lines @@
         // TODO(ahe): We know almost exactly what has changed.  It could be
         // more efficient to only communicate what changed.
         context.currentCompilationUnit.content = getText(mainEditorPane);
 
         // Discard highlighting mutations.
         observer.takeRecords();
         return;
       }
     }
 
-    // TODO(ahe): Use getText(mainEditorPane) instead.
-    removeShadowRootPolyfill(mainEditorPane);
-
-    String currentText = mainEditorPane.text;
+    String currentText = getText(mainEditorPane);
     trySelection.updateText(currentText);
 
     context.currentCompilationUnit.content = currentText;
 
     editor.seenIdentifiers = new Set<String>.from(mock.identifiers);
 
     editor.isMalformedInput = false;
     int offset = 0;
     List<Node> nodes = <Node>[];
 
@@ skipping 553 matching lines @@
   return text.split(new RegExp('^', multiLine: true));
 }
 
 void removeCodeCompletion() {
   List<Node> highlighting =
       mainEditorPane.querySelectorAll('.dart-code-completion');
   for (Element element in highlighting) {
     element.remove();
   }
 }