Move the individual property definitions from client/base/Css to CSSStyleDeclaration.

client/touch/InfiniteScroller.dart

Index: client/touch/InfiniteScroller.dart
diff --git a/client/touch/InfiniteScroller.dart b/client/touch/InfiniteScroller.dart
index 3f7bc484546bf565e10d8870725861152ea49045..e06483df0da6aa5b5b2b01da1fbcd520d2889c40 100644
--- a/client/touch/InfiniteScroller.dart
+++ b/client/touch/InfiniteScroller.dart
@@ -136,10 +136,10 @@ class InfiniteScroller {
   void _updateVisibility(bool isLoading, Element element,
                          Element loadingElement) {
     if (element != null) {
-      Css.setDisplay(element.style, isLoading ? "none" : "");
+      element.style.display = isLoading ? "none" : "";
     }
     if (loadingElement != null) {
-      Css.setDisplay(loadingElement.style, isLoading ? "" : "none");
+      loadingElement.style.display = isLoading ? "" : "none";
     }
   }
 }