BrowserPlugin/WebView - Move plugin lifetime to DOM

Source/core/rendering/RenderWidget.h

Index: Source/core/rendering/RenderWidget.h
diff --git a/Source/core/rendering/RenderWidget.h b/Source/core/rendering/RenderWidget.h
index b9ed0f9c4aae2eb13369dd1abe95c9de90ff9278..4f7c9ef8994dcfc1991e4e47a45a189a59941fb9 100644
--- a/Source/core/rendering/RenderWidget.h
+++ b/Source/core/rendering/RenderWidget.h
@@ -31,8 +31,9 @@ class RenderWidget : public RenderReplaced {
 public:
     virtual ~RenderWidget();
 
-    Widget* widget() const { return m_widget.get(); }
-    virtual void setWidget(PassRefPtr<Widget>);
+    Widget* widget() const;
+    virtual void attachWidget(Widget*);
+    virtual void detachWidget(Widget*);
 
     void updateWidgetPosition();
     void widgetPositionsUpdated();
@@ -54,8 +55,6 @@ protected:
 
     FrameView* frameView() const { return m_frameView; }
 
-    void clearWidget();
-
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
     virtual void layout();
     virtual void paint(PaintInfo&, const LayoutPoint&);
@@ -73,7 +72,6 @@ private:
     bool setWidgetGeometry(const LayoutRect&);
     bool updateWidgetGeometry();
 
-    RefPtr<Widget> m_widget;
     FrameView* m_frameView;
     IntRect m_clipRect; // The rectangle needs to remain correct after scrolling, so it is stored in content view coordinates, and not clipped to window.
     int m_refCount;