Early out if the scroll position passed in by js is NaN

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index e6adcbf20803289c0b34ae37f93e15ae70b84cb8..63162b5f190958312a3b58fc108cc2480d829d08 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -665,9 +665,12 @@ void Element::setScrollLeft(double newLeft)
 {
     document().updateLayoutIgnorePendingStylesheets();
 
+    if (std::isnan(newLeft))
+        return;
+
     if (document().documentElement() != this) {
         RenderBox* rend = renderBox();
-        if (rend && !std::isnan(newLeft))
+        if (rend)
             rend->setScrollLeft(LayoutUnit::fromFloatRound(newLeft * rend->style()->effectiveZoom()));
         return;
     }
@@ -712,9 +715,12 @@ void Element::setScrollTop(double newTop)
 {
     document().updateLayoutIgnorePendingStylesheets();
 
+    if (std::isnan(newTop))
+        return;
+
     if (document().documentElement() != this) {
         RenderBox* rend = renderBox();
-        if (rend && !std::isnan(newTop))
+        if (rend)
             rend->setScrollTop(LayoutUnit::fromFloatRound(newTop * rend->style()->effectiveZoom()));
         return;
     }