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 4813badfa6d09a11e38a60368f9a39cb94f5f401..4e69deb1124d0c7aea28c89db8e2b0b366a524e0 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -719,7 +719,7 @@ int Element::scrollWidth()
 {
     document().updateLayoutIgnorePendingStylesheets();
     if (LayoutBox* box = layoutBox())
-        return adjustLayoutUnitForAbsoluteZoom(box->scrollWidth(), *box).toDouble();
+        return adjustLayoutUnitForAbsoluteZoom(box->scrollWidth(), *box).round();
     return 0;
 }
 
@@ -727,7 +727,7 @@ int Element::scrollHeight()
 {
     document().updateLayoutIgnorePendingStylesheets();
     if (LayoutBox* box = layoutBox())
-        return adjustLayoutUnitForAbsoluteZoom(box->scrollHeight(), *box).toDouble();
+        return adjustLayoutUnitForAbsoluteZoom(box->scrollHeight(), *box).round();
     return 0;
 }