Make getKeys, getValues getters (keys, values).

lib/html/templates/html/impl/impl_Element.darttemplate

Index: lib/html/templates/html/impl/impl_Element.darttemplate
diff --git a/lib/html/templates/html/impl/impl_Element.darttemplate b/lib/html/templates/html/impl/impl_Element.darttemplate
index 4f516ac2b6f51bba62455edff16c8e0394891775..e7610dd97dfe677d9fcd1aa186c3bae53e7756d9 100644
--- a/lib/html/templates/html/impl/impl_Element.darttemplate
+++ b/lib/html/templates/html/impl/impl_Element.darttemplate
@@ -352,7 +352,7 @@ class _ElementAttributeMap implements AttributeMap {
     }
   }
 
-  Collection<String> getKeys() {
+  Collection<String> get keys {
     // TODO(jacobr): generate a lazy collection instead.
     final attributes = _element.$dom_attributes;
     final keys = new List<String>(attributes.length);
@@ -362,7 +362,7 @@ class _ElementAttributeMap implements AttributeMap {
     return keys;
   }
 
-  Collection<String> getValues() {
+  Collection<String> get values {
     // TODO(jacobr): generate a lazy collection instead.
     final attributes = _element.$dom_attributes;
     final values = new List<String>(attributes.length);
@@ -400,7 +400,7 @@ class _DataAttributeMap implements AttributeMap {
   // interface Map
 
   // TODO: Use lazy iterator when it is available on Map.
-  bool containsValue(String value) => getValues().some((v) => v == value);
+  bool containsValue(String value) => values.some((v) => v == value);
 
   bool containsKey(String key) => $dom_attributes.containsKey(_attr(key));
 
@@ -417,7 +417,7 @@ class _DataAttributeMap implements AttributeMap {
 
   void clear() {
     // Needs to operate on a snapshot since we are mutating the collection.
-    for (String key in getKeys()) {
+    for (String key in keys) {
       remove(key);
     }
   }
@@ -430,7 +430,7 @@ class _DataAttributeMap implements AttributeMap {
     });
   }
 
-  Collection<String> getKeys() {
+  Collection<String> get keys {
     final keys = new List<String>();
     $dom_attributes.forEach((String key, String value) {
       if (_matches(key)) {
@@ -440,7 +440,7 @@ class _DataAttributeMap implements AttributeMap {
     return keys;
   }
 
-  Collection<String> getValues() {
+  Collection<String> get values {
     final values = new List<String>();
     $dom_attributes.forEach((String key, String value) {
       if (_matches(key)) {
@@ -450,7 +450,7 @@ class _DataAttributeMap implements AttributeMap {
     return values;
   }
 
-  int get length => getKeys().length;
+  int get length => keys.length;
 
   // TODO: Use lazy iterator when it is available on Map.
   bool get isEmpty => length == 0;
@@ -672,7 +672,7 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   void set attributes(Map<String, String> value) {
     Map<String, String> attributes = this.attributes;
     attributes.clear();
-    for (String key in value.getKeys()) {
+    for (String key in value.keys) {
       attributes[key] = value[key];
     }
   }
@@ -704,7 +704,7 @@ class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
   void set dataAttributes(Map<String, String> value) {
     final dataAttributes = this.dataAttributes;
     dataAttributes.clear();
-    for (String key in value.getKeys()) {
+    for (String key in value.keys) {
       dataAttributes[key] = value[key];
     }
   }