Check for an active document in WebPluginContainerImpl::windowClipRect

Source/web/WebPluginContainerImpl.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2014 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 954 matching lines @@
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect.x(), -frameRect.y());
 }
 
 IntRect WebPluginContainerImpl::windowClipRect() const
 {
     // Start by clipping to our bounds.
     IntRect clipRect =
         convertToContainingWindow(IntRect(0, 0, width(), height()));
 
-    // document().renderView() can be 0 when we receive messages from the
-    // plugins while we are destroying a frame.
-    // FIXME: Can we just check m_element->document().isActive() ?
-    if (m_element->renderer()->document().renderView()) {
+    if (m_element->document().isActive()) {
         // Take our element and get the clip rect from the enclosing layer and
         // frame view.
         clipRect.intersect(
             m_element->document().view()->windowClipRectForFrameOwner(m_element));
     }
 
     return clipRect;
 }
 
 bool WebPluginContainerImpl::pluginShouldPersist() const
 {
     return m_webPlugin->shouldPersist();
 }
 
 } // namespace blink