remove another use of fromTrustedString

Change-Id: I23f06792bcae8c46b9e6f172368c56844b1924b8
diff --git a/user/src/com/google/gwt/cell/client/IconCellDecorator.java b/user/src/com/google/gwt/cell/client/IconCellDecorator.java
index 7aeee08..365bee0 100644
--- a/user/src/com/google/gwt/cell/client/IconCellDecorator.java
+++ b/user/src/com/google/gwt/cell/client/IconCellDecorator.java
@@ -190,7 +190,7 @@
       image = SafeHtmlUtils.fromSafeConstant("<div></div>");
     } else {
       AbstractImagePrototype proto = AbstractImagePrototype.create(res);
-      image = SafeHtmlUtils.fromTrustedString(proto.getHTML());
+      image = proto.getSafeHtml();
     }
 
     // Create the wrapper based on the vertical alignment.