Made PinchViewport a ScrollableArea

Source/platform/scroll/ScrollView.cpp

Index: Source/platform/scroll/ScrollView.cpp
diff --git a/Source/platform/scroll/ScrollView.cpp b/Source/platform/scroll/ScrollView.cpp
index 4b778ab6951c066d3e4ed868b0a655f81cec7463..9062ec7abdf882ba7cbae20c0af73909e361fe02 100644
--- a/Source/platform/scroll/ScrollView.cpp
+++ b/Source/platform/scroll/ScrollView.cpp
@@ -1112,13 +1112,4 @@ void ScrollView::setScrollOrigin(const IntPoint& origin, bool updatePositionAtAl
         updateScrollbars(scrollOffset());
 }
 
-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