Allow objects without scrollbars to be scrollable

Source/core/platform/Scrollbar.cpp

Index: Source/core/platform/Scrollbar.cpp
diff --git a/Source/core/platform/Scrollbar.cpp b/Source/core/platform/Scrollbar.cpp
index 7bf8b4107a4bbcdc877580ab2b23a161e0d536a7..6bf7a0bc34909a7d3c046d651bf9cf970569c85d 100644
--- a/Source/core/platform/Scrollbar.cpp
+++ b/Source/core/platform/Scrollbar.cpp
@@ -55,12 +55,6 @@ PassRefPtr<Scrollbar> Scrollbar::createNativeScrollbar(ScrollableArea* scrollabl
     return adoptRef(new Scrollbar(scrollableArea, orientation, size));
 }
 
-int Scrollbar::maxOverlapBetweenPages()
-{
-    static int maxOverlapBetweenPages = ScrollbarTheme::theme()->maxOverlapBetweenPages();
-    return maxOverlapBetweenPages;
-}
-
 Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orientation, ScrollbarControlSize controlSize,
                      ScrollbarTheme* theme)
     : m_scrollableArea(scrollableArea)
@@ -71,9 +65,6 @@ Scrollbar::Scrollbar(ScrollableArea* scrollableArea, ScrollbarOrientation orient
     , m_totalSize(0)
     , m_currentPos(0)
     , m_dragOrigin(0)
-    , m_lineStep(0)
-    , m_pageStep(0)
-    , m_pixelStep(1)
     , m_hoveredPart(NoPart)
     , m_pressedPart(NoPart)
     , m_pressedPos(0)
@@ -158,13 +149,6 @@ void Scrollbar::setProportion(int visibleSize, int totalSize)
     updateThumbProportion();
 }
 
-void Scrollbar::setSteps(int lineStep, int pageStep, int pixelsPerStep)
-{
-    m_lineStep = lineStep;
-    m_pageStep = pageStep;
-    m_pixelStep = 1.0f / pixelsPerStep;
-}
-
 void Scrollbar::updateThumb()
 {
 #ifdef THUMB_POSITION_AFFECTS_BUTTONS