Remove unnecessary dependency upon ScrollView from the ScrollbarTheme classes.

Source/core/platform/ScrollView.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 818 matching lines @@
     updateScrollbars(scrollOffset());
     positionScrollbarLayers();
 }
 
 void ScrollView::updateScrollCorner()
 {
 }
 
 void ScrollView::paintScrollCorner(GraphicsContext* context, const IntRect& cornerRect)
 {
-    ScrollbarTheme::theme()->paintScrollCorner(this, context, cornerRect);
+    ScrollbarTheme::theme()->paintScrollCorner(context, cornerRect);
 }
 
 void ScrollView::paintScrollbar(GraphicsContext* context, Scrollbar* bar, const IntRect& rect)
 {
     bar->paint(context, rect);
 }
 
 void ScrollView::invalidateScrollCornerRect(const IntRect& rect)
 {
     invalidateRect(rect);
@@ skipping 119 matching lines @@
     IntRect verticalOverhangRect;
     calculateOverhangAreasForPainting(horizontalOverhangRect, verticalOverhangRect);
     if (!horizontalOverhangRect.isEmpty())
         window->invalidateContentsAndRootView(horizontalOverhangRect);
     if (!verticalOverhangRect.isEmpty())
         window->invalidateContentsAndRootView(verticalOverhangRect);
 }
 
 void ScrollView::paintOverhangAreas(GraphicsContext* context, const IntRect& horizontalOverhangRect, const IntRect& verticalOverhangRect, const IntRect& dirtyRect)
 {
-    ScrollbarTheme::theme()->paintOverhangBackground(this, context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
-    ScrollbarTheme::theme()->paintOverhangShadows(this, context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
+    ScrollbarTheme::theme()->paintOverhangBackground(context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
+    ScrollbarTheme::theme()->paintOverhangShadows(context, scrollOffset(), horizontalOverhangRect, verticalOverhangRect, dirtyRect);
 }
 
 void ScrollView::calculateAndPaintOverhangAreas(GraphicsContext* context, const IntRect& dirtyRect)
 {
     IntRect horizontalOverhangRect;
     IntRect verticalOverhangRect;
     calculateOverhangAreasForPainting(horizontalOverhangRect, verticalOverhangRect);
 
     if (dirtyRect.intersects(horizontalOverhangRect) || dirtyRect.intersects(verticalOverhangRect))
         paintOverhangAreas(context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
 }
 
 void ScrollView::calculateAndPaintOverhangBackground(GraphicsContext* context, const IntRect& dirtyRect)
 {
     IntRect horizontalOverhangRect;
     IntRect verticalOverhangRect;
     calculateOverhangAreasForPainting(horizontalOverhangRect, verticalOverhangRect);
 
     if (dirtyRect.intersects(horizontalOverhangRect) || dirtyRect.intersects(verticalOverhangRect))
-        ScrollbarTheme::theme()->paintOverhangBackground(this, context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
+        ScrollbarTheme::theme()->paintOverhangBackground(context, horizontalOverhangRect, verticalOverhangRect, dirtyRect);
 }
 
 bool ScrollView::isPointInScrollbarCorner(const IntPoint& windowPoint)
 {
     if (!scrollbarCornerPresent())
         return false;
 
     IntPoint viewPoint = convertFromContainingWindow(windowPoint);
 
     if (m_horizontalScrollbar) {
@@ skipping 133 matching lines @@
 int ScrollView::pageStep(ScrollbarOrientation orientation) const
 {
     int length = (orientation == HorizontalScrollbar) ? visibleWidth() : visibleHeight();
     int minPageStep = static_cast<float>(length) * minFractionToStepWhenPaging();
     int pageStep = std::max(minPageStep, length - maxOverlapBetweenPages());
 
     return std::max(pageStep, 1);
 }
 
 } // namespace WebCore