Change Page::m_mainFrame to be a Frame.

Source/core/page/SpatialNavigation.cpp

 /*
  * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org>
  *
  * 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
@@ skipping 672 matching lines @@
         return;
     }
 
     double euclidianDistancePow2 = (xAxis * xAxis + yAxis * yAxis).toDouble();
     LayoutRect intersectionRect = intersection(currentRect, nodeRect);
     double overlap = (intersectionRect.width() * intersectionRect.height()).toDouble();
 
     // Distance calculation is based on http://www.w3.org/TR/WICD/#focus-handling
     candidate.distance = sqrt(euclidianDistancePow2) + navigationAxisDistance+ orthogonalAxisDistance * 2 - sqrt(overlap);
 
-    LayoutSize viewSize = candidate.visibleNode->document().page()->mainFrame()->view()->visibleContentRect().size();
+    // FIXME: Doesn't work with OOPI.
+    LayoutSize viewSize = toLocalFrame(candidate.visibleNode->document().page()->mainFrame())->view()->visibleContentRect().size();
     candidate.alignment = alignmentForRects(type, currentRect, nodeRect, viewSize);
 }
 
 bool canBeScrolledIntoView(FocusType type, const FocusCandidate& candidate)
 {
     ASSERT(candidate.visibleNode && candidate.isOffscreen);
     LayoutRect candidateRect = candidate.rect;
     for (Node* parentNode = candidate.visibleNode->parentNode(); parentNode; parentNode = parentNode->parentNode()) {
         LayoutRect parentRect = nodeRectInAbsoluteCoordinates(parentNode);
         if (!candidateRect.intersects(parentRect)) {
@@ skipping 44 matching lines @@
     LayoutRect rect = virtualRectForDirection(type, rectToAbsoluteCoordinates(area.document().frame(), area.computeRect(area.imageElement()->renderer())), 1);
     return rect;
 }
 
 HTMLFrameOwnerElement* frameOwnerElement(FocusCandidate& candidate)
 {
     return candidate.isFrameOwnerElement() ? toHTMLFrameOwnerElement(candidate.visibleNode) : 0;
 };
 
 } // namespace WebCore