Delete widget tree (FrameView::parent_)

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

Index: third_party/WebKit/Source/core/frame/FrameView.h
diff --git a/third_party/WebKit/Source/core/frame/FrameView.h b/third_party/WebKit/Source/core/frame/FrameView.h
index 32f6a9dfea394b49053edd465a881117538dcb5b..bf20d77593682db7ffc34321b19c5ba3740aad01 100644
--- a/third_party/WebKit/Source/core/frame/FrameView.h
+++ b/third_party/WebKit/Source/core/frame/FrameView.h
@@ -493,7 +493,11 @@ class CORE_EXPORT FrameView final
   void SetParentVisible(bool) override;
   void SetSelfVisible(bool v) { self_visible_ = v; }
   void SetParent(FrameView*) override;
-  FrameView* Parent() const override { return parent_; }
+  FrameView* Parent() const override;
+  void SetFrameOrPluginState(FrameOrPluginState) override;
+  FrameOrPluginState GetFrameOrPluginState() const override {
+    return frame_view_state_;
+  }
   void RemoveChild(FrameOrPlugin*);
   using PluginSet = HeapHashSet<Member<PluginView>>;
   const PluginSet& Plugins() const { return plugins_; }
@@ -1077,6 +1081,7 @@ class CORE_EXPORT FrameView final
 
   IntRect frame_rect_;
   Member<FrameView> parent_;
+  FrameOrPluginState frame_view_state_;
   bool self_visible_;
   bool parent_visible_;