Move the Widget hierarchy to the Oilpan heap.

Source/core/frame/RemoteFrameView.cpp

Index: Source/core/frame/RemoteFrameView.cpp
diff --git a/Source/core/frame/RemoteFrameView.cpp b/Source/core/frame/RemoteFrameView.cpp
index b26df31e163a386d90b1d8fa9a744165b44065df..c5cbe4e69dfbb8ebc5bc51dd2f8fd74fd499dd40 100644
--- a/Source/core/frame/RemoteFrameView.cpp
+++ b/Source/core/frame/RemoteFrameView.cpp
@@ -20,9 +20,9 @@ RemoteFrameView::~RemoteFrameView()
 {
 }
 
-PassRefPtr<RemoteFrameView> RemoteFrameView::create(RemoteFrame* remoteFrame)
+PassRefPtrWillBeRawPtr<RemoteFrameView> RemoteFrameView::create(RemoteFrame* remoteFrame)
 {
-    RefPtr<RemoteFrameView> view = adoptRef(new RemoteFrameView(remoteFrame));
+    RefPtrWillBeRawPtr<RemoteFrameView> view = adoptRefWillBeNoop(new RemoteFrameView(remoteFrame));
     view->show();
     return view.release();
 }
@@ -56,4 +56,10 @@ void RemoteFrameView::frameRectsChanged()
     // FIXME: Notify embedder via WebLocalFrameClient when that is possible.
 }
 
+void RemoteFrameView::trace(Visitor* visitor)
+{
+    visitor->trace(m_remoteFrame);
+    Widget::trace(visitor);
+}
+
 } // namespace blink