Use LayoutUnit::fromFloatRound for setting scroll values

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 438e0a2b670744d44c94116f38379b5e31d74ef4..9a028feda3fa93351938554e53c44e05ce8ded0f 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -689,7 +689,7 @@ void Element::setScrollLeft(int newLeft)
 
     if (document().documentElement() != this) {
         if (RenderBox* rend = renderBox())
-            rend->setScrollLeft(roundf(newLeft * rend->style()->effectiveZoom()));
+            rend->setScrollLeft(LayoutUnit::fromFloatRound(newLeft * rend->style()->effectiveZoom()));
         return;
     }
 
@@ -735,7 +735,7 @@ void Element::setScrollTop(int newTop)
 
     if (document().documentElement() != this) {
         if (RenderBox* rend = renderBox())
-            rend->setScrollTop(roundf(newTop * rend->style()->effectiveZoom()));
+            rend->setScrollTop(LayoutUnit::fromFloatRound(newTop * rend->style()->effectiveZoom()));
         return;
     }