Speculative fix for WebPluginContainerImpl::calculateGeometry nullptr crashes.

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 399 matching lines @@
 }
 
 void WebPluginContainerImpl::scrollRect(const WebRect& rect)
 {
     invalidateRect(rect);
 }
 
 void WebPluginContainerImpl::reportGeometry()
 {
     // We cannot compute geometry without a parent or layoutObject.
-    if (!parent() || !m_element->layoutObject())
+    if (!parent() || !m_element || !m_element->layoutObject())
         return;
 
     IntRect windowRect, clipRect, unobscuredRect;
     Vector<IntRect> cutOutRects;
     calculateGeometry(windowRect, clipRect, unobscuredRect, cutOutRects);
 
     m_webPlugin->updateGeometry(windowRect, clipRect, unobscuredRect, cutOutRects, isVisible());
 
     if (m_scrollbarGroup) {
         m_scrollbarGroup->scrollAnimator()->contentsResized();
@@ skipping 583 matching lines @@
     for (size_t i = 0; i < cutOutRects.size(); i++)
         cutOutRects[i].move(-frameRect().x(), -frameRect().y());
 }
 
 bool WebPluginContainerImpl::pluginShouldPersist() const
 {
     return m_webPlugin->shouldPersist();
 }
 
 } // namespace blink