Delete widget tree (FrameView::parent_)

third_party/WebKit/Source/core/frame/RemoteFrameView.h

Index: third_party/WebKit/Source/core/frame/RemoteFrameView.h
diff --git a/third_party/WebKit/Source/core/frame/RemoteFrameView.h b/third_party/WebKit/Source/core/frame/RemoteFrameView.h
index 96a32581a30f80fe7d597e3c1faf004bbdf2c7bc..3c11baf7747db6bd848620fb7238565ff946234e 100644
--- a/third_party/WebKit/Source/core/frame/RemoteFrameView.h
+++ b/third_party/WebKit/Source/core/frame/RemoteFrameView.h
@@ -26,7 +26,12 @@ class RemoteFrameView final : public GarbageCollectedFinalized<RemoteFrameView>,
   ~RemoteFrameView() override;
 
   void SetParent(FrameView*) override;
-  FrameView* Parent() const override { return parent_; }
+  FrameView* Parent() const override;
+  void SetFrameOrPluginState(FrameOrPluginState) override;
+  FrameOrPluginState GetFrameOrPluginState() const {
+    return remote_frame_view_state_;
+  }
+  FrameView* ParentFrameView() const;
 
   RemoteFrame& GetFrame() const {
     DCHECK(remote_frame_);
@@ -59,6 +64,7 @@ class RemoteFrameView final : public GarbageCollectedFinalized<RemoteFrameView>,
   // details.
   Member<RemoteFrame> remote_frame_;
   Member<FrameView> parent_;
+  FrameOrPluginState remote_frame_view_state_;
   IntRect last_viewport_intersection_;
   IntRect frame_rect_;
   bool self_visible_;