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

tools/dom/src/AttributeMap.dart

Index: tools/dom/src/AttributeMap.dart
diff --git a/tools/dom/src/AttributeMap.dart b/tools/dom/src/AttributeMap.dart
index 76a90648c1802ebf90e67999f5aaa4c3eff2b072..39ca3668413503d1712a61f46ec75d168064af2f 100644
--- a/tools/dom/src/AttributeMap.dart
+++ b/tools/dom/src/AttributeMap.dart
@@ -159,27 +159,27 @@ class _NamespacedAttributeMap extends _AttributeMap {
  */
 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.
@@ -189,7 +189,7 @@ class _DataAttributeMap implements Map<String, String> {
   }
 
   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);
       }
@@ -198,7 +198,7 @@ class _DataAttributeMap implements Map<String, String> {
 
   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));
       }
@@ -208,7 +208,7 @@ class _DataAttributeMap implements Map<String, String> {
 
   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);
       }