Make scrollWidth and scrollHeight match other DOM measurement APIs

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 778ecdfd7218e53761ddd96d16305c1e385d4335..71191c2d41e13f567b68072831047999af2ca051 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -799,7 +799,7 @@ int Element::scrollWidth()
 {
     document().updateLayoutIgnorePendingStylesheets();
     if (LayoutBox* box = layoutBox())
-        return adjustLayoutUnitForAbsoluteZoom(box->scrollWidth(), *box).toDouble();
+        return adjustLayoutUnitForAbsoluteZoom(box->scrollWidth(), *box).round();
     return 0;
 }
 
@@ -807,7 +807,7 @@ int Element::scrollHeight()
 {
     document().updateLayoutIgnorePendingStylesheets();
     if (LayoutBox* box = layoutBox())
-        return adjustLayoutUnitForAbsoluteZoom(box->scrollHeight(), *box).toDouble();
+        return adjustLayoutUnitForAbsoluteZoom(box->scrollHeight(), *box).round();
     return 0;
 }