Delete some dead ScrollAlignment code.

sky/engine/core/rendering/ScrollAlignment.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 34 matching lines @@
 #include "sky/engine/core/rendering/ScrollAlignment.h"
 
 #include "sky/engine/platform/geometry/LayoutRect.h"
 
 namespace blink {
 
 const ScrollAlignment ScrollAlignment::alignCenterIfNeeded = { ScrollAlignmentNoScroll, ScrollAlignmentCenter, ScrollAlignmentClosestEdge };
 const ScrollAlignment ScrollAlignment::alignToEdgeIfNeeded = { ScrollAlignmentNoScroll, ScrollAlignmentClosestEdge, ScrollAlignmentClosestEdge };
 const ScrollAlignment ScrollAlignment::alignCenterAlways = { ScrollAlignmentCenter, ScrollAlignmentCenter, ScrollAlignmentCenter };
 const ScrollAlignment ScrollAlignment::alignTopAlways = { ScrollAlignmentTop, ScrollAlignmentTop, ScrollAlignmentTop };
-const ScrollAlignment ScrollAlignment::alignBottomAlways = { ScrollAlignmentBottom, ScrollAlignmentBottom, ScrollAlignmentBottom };
 
 #define MIN_INTERSECT_FOR_REVEAL 32
 
 LayoutRect ScrollAlignment::getRectToExpose(const LayoutRect& visibleRect, const LayoutRect& exposeRect, const ScrollAlignment& alignX, const ScrollAlignment& alignY)
 {
     // Determine the appropriate X behavior.
     ScrollAlignmentBehavior scrollX;
     LayoutRect exposeRectX(exposeRect.x(), visibleRect.y(), exposeRect.width(), visibleRect.height());
     LayoutUnit intersectWidth = intersection(visibleRect, exposeRectX).width();
     if (intersectWidth == exposeRect.width() || intersectWidth >= MIN_INTERSECT_FOR_REVEAL) {
@@ skipping 71 matching lines @@
         y = exposeRect.maxY() - visibleRect.height();
     else if (scrollY == ScrollAlignmentCenter)
         y = exposeRect.y() + (exposeRect.height() - visibleRect.height()) / 2;
     else
         y = exposeRect.y();
 
     return LayoutRect(LayoutPoint(x, y), visibleRect.size());
 }
 
 }; // namespace blink