Prevented connecting drag drop events to a SwappedOut RenderViewHost in WebContentsViewGtk

content/browser/web_contents/web_drag_dest_gtk.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "base/gtest_prod_util.h"
@@ skipping 20 matching lines @@
   WebDropData* current_drop_data() const { return drop_data_.get(); }
 
   // This is called when the renderer responds to a drag motion event. We must
   // update the system drag cursor.
   void UpdateDragStatus(WebKit::WebDragOperation operation);
 
   // Informs the renderer when a system drag has left the render view.
   // See OnDragLeave().
   void DragLeave();
 
+  GtkWidget* widget() const { return widget_; }
+
   WebDragDestDelegate* delegate() const { return delegate_; }
   void set_delegate(WebDragDestDelegate* delegate) { delegate_ = delegate; }
 
  private:
   RenderViewHostImpl* GetRenderViewHost() const;
 
   // Called when a system drag crosses over the render view. As there is no drag
   // enter event, we treat it as an enter event (and not a regular motion event)
   // when |context_| is NULL.
   CHROMEGTK_CALLBACK_4(WebDragDestGtk, gboolean, OnDragMotion, GdkDragContext*,
@@ skipping 49 matching lines @@
   WebDragDestDelegate* delegate_;
 
   base::WeakPtrFactory<WebDragDestGtk> method_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragDestGtk);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_GTK_H_