Make CSSStyleSheet.insertRule() / deleteRule() arguments mandatory

LayoutTests/editing/selection/first-letter-selection-crash.html

Index: LayoutTests/editing/selection/first-letter-selection-crash.html
diff --git a/LayoutTests/editing/selection/first-letter-selection-crash.html b/LayoutTests/editing/selection/first-letter-selection-crash.html
index 969cff2d4ccc88a982d18e9d16cc7370158fa9ff..f19dfe9ea03759b42df9603bcce4b892dc332d09 100755
--- a/LayoutTests/editing/selection/first-letter-selection-crash.html
+++ b/LayoutTests/editing/selection/first-letter-selection-crash.html
@@ -19,7 +19,7 @@ window.onload = function() {
     test1.appendChild(document.createTextNode('a'));
     document.execCommand('selectall');
     document.body.offsetTop;
-    document.styleSheets[0].insertRule("#test2 { text-transform: uppercase }");
+    document.styleSheets[0].insertRule("#test2 { text-transform: uppercase }", 0);
     document.body.offsetTop;
     document.body.innerHTML = "PASS";
 }