Making almost all dom_ methods private. Exceptions will be addressed in a later CL.

tools/dom/src/AttributeMap.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.
 
 part of html;
 
 abstract class _AttributeMap implements Map<String, String> {
   final Element _element;
 
   _AttributeMap(this._element);
@@ skipping 141 matching lines @@
   bool _matches(Node node) => node.$dom_namespaceUri == _namespace;
 }
 
 
 /**
  * Provides a Map abstraction on top of data-* attributes, similar to the
  * dataSet in the old DOM.
  */
 class _DataAttributeMap implements Map<String, String> {
 
-  final Map<String, String> $dom_attributes;
+  final Map<String, String> _attributes;
 
-  _DataAttributeMap(this.$dom_attributes);
+  _DataAttributeMap(this._attributes);
 
   // interface Map
 
   // TODO: Use lazy iterator when it is available on Map.
   bool containsValue(String value) => values.any((v) => v == value);
 
-  bool containsKey(String key) => $dom_attributes.containsKey(_attr(key));
+  bool containsKey(String key) => _attributes.containsKey(_attr(key));
 
-  String operator [](String key) => $dom_attributes[_attr(key)];
+  String operator [](String key) => _attributes[_attr(key)];
 
   void operator []=(String key, String value) {
-    $dom_attributes[_attr(key)] = value;
+    _attributes[_attr(key)] = value;
   }
 
   String putIfAbsent(String key, String ifAbsent()) =>
-    $dom_attributes.putIfAbsent(_attr(key), ifAbsent);
+    _attributes.putIfAbsent(_attr(key), ifAbsent);
 
-  String remove(String key) => $dom_attributes.remove(_attr(key));
+  String remove(String key) => _attributes.remove(_attr(key));
 
   void clear() {
     // Needs to operate on a snapshot since we are mutating the collection.
     for (String key in keys) {
       remove(key);
     }
   }
 
   void forEach(void f(String key, String value)) {
-    $dom_attributes.forEach((String key, String value) {
+    _attributes.forEach((String key, String value) {
       if (_matches(key)) {
         f(_strip(key), value);
       }
     });
   }
 
   Iterable<String> get keys {
     final keys = new List<String>();
-    $dom_attributes.forEach((String key, String value) {
+    _attributes.forEach((String key, String value) {
       if (_matches(key)) {
         keys.add(_strip(key));
       }
     });
     return keys;
   }
 
   Iterable<String> get values {
     final values = new List<String>();
-    $dom_attributes.forEach((String key, String value) {
+    _attributes.forEach((String key, String value) {
       if (_matches(key)) {
         values.add(value);
       }
     });
     return values;
   }
 
   int get length => keys.length;
 
   // TODO: Use lazy iterator when it is available on Map.
   bool get isEmpty => length == 0;
 
   bool get isNotEmpty => !isEmpty;
 
   // Helpers.
   String _attr(String key) => 'data-$key';
   bool _matches(String key) => key.startsWith('data-');
   String _strip(String key) => key.substring(5);
 }