Oilpan: move RenderObjects off heap.

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 194 matching lines @@
 
     disposeAutoSizeInfo();
 #if ENABLE(OILPAN) && ENABLE(ASSERT)
     m_hasBeenDisposed = true;
 #endif
 }
 
 void FrameView::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
-    visitor->trace(m_partUpdateSet);
-    visitor->trace(m_parts);
     visitor->trace(m_frame);
     visitor->trace(m_nodeToDraw);
     visitor->trace(m_maintainScrollPositionAnchor);
-    visitor->trace(m_scrollCorner);
     visitor->trace(m_autoSizeInfo);
     visitor->trace(m_horizontalScrollbar);
     visitor->trace(m_verticalScrollbar);
     visitor->trace(m_children);
 #endif
     Widget::trace(visitor);
 }
 
 void FrameView::reset()
 {
@@ skipping 924 matching lines @@
     m_parts.add(object);
 }
 
 void FrameView::removePart(RenderPart* object)
 {
     m_parts.remove(object);
 }
 
 void FrameView::updateWidgetPositions()
 {
-    WillBeHeapVector<RefPtrWillBeMember<RenderPart>> parts;
+    Vector<RefPtr<RenderPart>> parts;
     copyToVector(m_parts, parts);
 
     // Script or plugins could detach the frame so abort processing if that happens.
 
     for (size_t i = 0; i < parts.size() && renderView(); ++i)
         parts[i]->updateWidgetPosition();
 
     for (size_t i = 0; i < parts.size() && renderView(); ++i)
         parts[i]->widgetPositionsUpdated();
 }
@@ skipping 2862 matching lines @@
 {
     Settings* settings = frame().settings();
     if (!settings || !settings->rootLayerScrolls())
         return this;
 
     RenderView* renderView = this->renderView();
     return renderView ? renderView->scrollableArea() : nullptr;
 }
 
 } // namespace blink