Background color buttons were not working in Composer and mail compose due to a bad case in a JS call. b=15126, r=brade, sr=kin, a=asa

editor/ui/composer/content/editor.js

@@ -1139,7 +1139,7 @@ function GetBackgroundElementWithColor()
       if (selection)
       {
         element = selection.focusNode;
-        while (!gEditor.NodeIsBlock(element))
+        while (!gEditor.nodeIsBlock(element))
           element = element.parentNode;
       }
       else