Pass implementation object to supplemental classes by reference

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2012 matching lines @@
 void FrameView::performPostLayoutTasks()
 {
     TRACE_EVENT0("webkit", "FrameView::performPostLayoutTasks");
     RefPtr<FrameView> protect(this);
 
     m_postLayoutTasksTimer.stop();
 
     m_frame->selection().setCaretRectNeedsUpdate();
     m_frame->selection().updateAppearance();
 
+    ASSERT(m_frame->document());
     if (m_nestedLayoutCount <= 1) {
         if (m_firstLayoutCallbackPending) {
             m_firstLayoutCallbackPending = false;
             m_frame->loader().didFirstLayout();
         }
 
         // Ensure that we always send this eventually.
         if (!m_frame->document()->parsing() && m_frame->loader().stateMachine()->committedFirstRealDocumentLoad())
             m_isVisuallyNonEmpty = true;
 
         // If the layout was done with pending sheets, we are not in fact visually non-empty yet.
         if (m_isVisuallyNonEmpty && !m_frame->document()->didLayoutWithPendingStylesheets() && m_firstVisuallyNonEmptyLayoutCallbackPending) {
             m_firstVisuallyNonEmptyLayoutCallbackPending = false;
             // FIXME: This callback is probably not needed, but is currently used
             // by android for setting the background color.
             m_frame->loader().client()->dispatchDidFirstVisuallyNonEmptyLayout();
         }
     }
 
-    FontFaceSet::didLayout(m_frame->document());
+    FontFaceSet::didLayout(*m_frame->document());
 
     updateWidgetPositions();
 
     // Plugins could have torn down the page inside updateWidgetPositions().
     if (!renderView())
         return;
 
     if (!m_updateWidgetsTimer.isActive())
         m_updateWidgetsTimer.startOneShot(0);
 
@@ skipping 1144 matching lines @@
 void FrameView::willRemoveScrollbar(Scrollbar* scrollbar, ScrollbarOrientation orientation)
 {
     ScrollableArea::willRemoveScrollbar(scrollbar, orientation);
     if (AXObjectCache* cache = axObjectCache()) {
         cache->remove(scrollbar);
         cache->handleScrollbarUpdate(this);
     }
 }
 
 } // namespace WebCore