Move frog dart:dom from fields to getters/setters.

client/dom/generated/src/frog/HTMLParamElement.dart

 
 class HTMLParamElement extends HTMLElement native "*HTMLParamElement" {
 
-  String name;
+  String get name() native "return this.name;";
 
-  String type;
+  void set name(String value) native "this.name = value;";
 
-  String value;
+  String get type() native "return this.type;";
 
-  String valueType;
+  void set type(String value) native "this.type = value;";
+
+  String get value() native "return this.value;";
+
+  void set value(String value) native "this.value = value;";
+
+  String get valueType() native "return this.valueType;";
+
+  void set valueType(String value) native "this.valueType = value;";
 }