Bug 420595 - Change the acceptButton icon to a "save" one when there is no choice. r=sdwilsh

Bug 420595 - "you have chosen to open" dialog uses wrong icon
When we present the basic choice for actions in the download helper
window, the accept button has the only effect of saving; thus we
should change the icon from "OK" to "Save".

toolkit/mozapps/downloads/src/nsHelperAppDlg.js.in

@@ -443,8 +443,13 @@ nsUnknownContentTypeDialog.prototype = {
         this.dialogElement("normalBox").collapsed = true;
         // show basic choice 
         this.dialogElement("basicBox").collapsed = false;
-        // change button labels
-        this.mDialog.document.documentElement.getButton("accept").label = this.dialogElement("strings").getString("unknownAccept.label");
+        // change button labels and icons; use "save" icon for the accept
+        // button since it's the only action possible
+        let acceptButton = this.mDialog.document.documentElement
+                               .getButton("accept");
+        acceptButton.label = this.dialogElement("strings")
+                                 .getString("unknownAccept.label");
+        acceptButton.setAttribute("icon", "save");
         this.mDialog.document.documentElement.getButton("cancel").label = this.dialogElement("strings").getString("unknownCancel.label");
         // hide other handler
         this.dialogElement("openHandler").collapsed = true;