Remove more dead code from core/ folder

Source/core/page/FocusController.cpp

Index: Source/core/page/FocusController.cpp
diff --git a/Source/core/page/FocusController.cpp b/Source/core/page/FocusController.cpp
index a75d57d3133212b33f5bc2a06b9c2ae0bed5029f..f84cd1284f9efe47ae081cc163a6e2057be7b46d 100644
--- a/Source/core/page/FocusController.cpp
+++ b/Source/core/page/FocusController.cpp
@@ -224,7 +224,6 @@ FocusController::FocusController(Page* page)
     , m_isActive(false)
     , m_isFocused(false)
     , m_isChangingFocusedFrame(false)
-    , m_containingWindowIsVisible(false)
 {
 }
 
@@ -693,45 +692,6 @@ void FocusController::setActive(bool active)
     toLocalFrame(focusedOrMainFrame())->selection().pageActivationChanged();
 }
 
-static void contentAreaDidShowOrHide(ScrollableArea* scrollableArea, bool didShow)
-{
-    if (didShow)
-        scrollableArea->contentAreaDidShow();
-    else
-        scrollableArea->contentAreaDidHide();
-}
-
-void FocusController::setContainingWindowIsVisible(bool containingWindowIsVisible)
-{
-    if (m_containingWindowIsVisible == containingWindowIsVisible)
-        return;
-
-    m_containingWindowIsVisible = containingWindowIsVisible;
-
-    FrameView* view = m_page->mainFrame()->view();
-    if (!view)
-        return;
-
-    contentAreaDidShowOrHide(view, containingWindowIsVisible);
-
-    for (LocalFrame* frame = m_page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
-        FrameView* frameView = frame->view();
-        if (!frameView)
-            continue;
-
-        const HashSet<ScrollableArea*>* scrollableAreas = frameView->scrollableAreas();
-        if (!scrollableAreas)
-            continue;
-
-        for (HashSet<ScrollableArea*>::const_iterator it = scrollableAreas->begin(), end = scrollableAreas->end(); it != end; ++it) {
-            ScrollableArea* scrollableArea = *it;
-            ASSERT(scrollableArea->scrollbarsCanBeActive());
-
-            contentAreaDidShowOrHide(scrollableArea, containingWindowIsVisible);
-        }
-    }
-}
-
 static void updateFocusCandidateIfNeeded(FocusType type, const FocusCandidate& current, FocusCandidate& candidate, FocusCandidate& closest)
 {
     ASSERT(candidate.visibleNode->isElementNode());