Delete some noop and dead scrollbar code.

sky/engine/platform/scroll/Scrollbar.cpp

Index: sky/engine/platform/scroll/Scrollbar.cpp
diff --git a/sky/engine/platform/scroll/Scrollbar.cpp b/sky/engine/platform/scroll/Scrollbar.cpp
index 523e2de51e65d93b1288ca3a384504b0de5ec971..d08cdb29f85eb3bb45fa935ed3f7f00c2f1224a3 100644
--- a/sky/engine/platform/scroll/Scrollbar.cpp
+++ b/sky/engine/platform/scroll/Scrollbar.cpp
@@ -62,7 +62,6 @@ Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orient
     , m_pressedPos(0)
     , m_scrollPos(0)
     , m_documentDragPos(0)
-    , m_enabled(true)
     , m_scrollTimer(this, &Scrollbar::autoscrollTimerFired)
     , m_overlapsResizer(false)
 {
@@ -80,11 +79,6 @@ Scrollbar::~Scrollbar()
     stopTimerIfNeeded();
 }
 
-ScrollbarOverlayStyle Scrollbar::scrollbarOverlayStyle() const
-{
-    return m_scrollableArea ? m_scrollableArea->scrollbarOverlayStyle() : ScrollbarOverlayStyleDefault;
-}
-
 bool Scrollbar::isScrollableAreaActive() const
 {
     return m_scrollableArea && m_scrollableArea->isActive();
@@ -370,14 +364,6 @@ void Scrollbar::mouseDown(const PlatformMouseEvent& evt)
     autoscrollPressedPart(initialAutoscrollTimerDelay());
 }
 
-void Scrollbar::setEnabled(bool e)
-{
-    if (m_enabled == e)
-        return;
-    m_enabled = e;
-    invalidate();
-}
-
 bool Scrollbar::isOverlayScrollbar() const
 {
     // FIXME(sky): Remove