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

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

Index: client/dom/generated/src/frog/SVGAnimationElement.dart
diff --git a/client/dom/generated/src/frog/SVGAnimationElement.dart b/client/dom/generated/src/frog/SVGAnimationElement.dart
index 13335f50fb88463c429938c40ae5b28da186c4f6..87c474d7011592e0388e63eb1183c353d2beb42b 100644
--- a/client/dom/generated/src/frog/SVGAnimationElement.dart
+++ b/client/dom/generated/src/frog/SVGAnimationElement.dart
@@ -1,7 +1,7 @@
 
 class SVGAnimationElement extends SVGElement native "*SVGAnimationElement" {
 
-  SVGElement targetElement;
+  SVGElement get targetElement() native "return this.targetElement;";
 
   num getCurrentTime() native;
 
@@ -11,17 +11,17 @@ class SVGAnimationElement extends SVGElement native "*SVGAnimationElement" {
 
   // From SVGTests
 
-  SVGStringList requiredExtensions;
+  SVGStringList get requiredExtensions() native "return this.requiredExtensions;";
 
-  SVGStringList requiredFeatures;
+  SVGStringList get requiredFeatures() native "return this.requiredFeatures;";
 
-  SVGStringList systemLanguage;
+  SVGStringList get systemLanguage() native "return this.systemLanguage;";
 
   bool hasExtension(String extension) native;
 
   // From SVGExternalResourcesRequired
 
-  SVGAnimatedBoolean externalResourcesRequired;
+  SVGAnimatedBoolean get externalResourcesRequired() native "return this.externalResourcesRequired;";
 
   // From ElementTimeControl