Fix plugin crash caused by removal of EMBED element during NPP_New....

webkit/glue/webframeloaderclient_impl.cc

 // Copyright (c) 2006-2009 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.
 
 #include "config.h"
 
 #include <string>
 #include <vector>
 
 #include "Chrome.h"
@@ skipping 1209 matching lines @@
   if (!webplugin)
     return NULL;
 
   // The container takes ownership of the WebPlugin.
   RefPtr<WebPluginContainerImpl> container =
       WebPluginContainerImpl::create(element, webplugin);
 
   if (!webplugin->initialize(container.get()))
     return NULL;
 
+  // The element might have been removed during plugin initialization!
+  if (!element->renderer())
+    return NULL;
+
   return container;
 }
 
 // This method gets called when a plugin is put in place of html content
 // (e.g., acrobat reader).
 void WebFrameLoaderClient::redirectDataToPlugin(Widget* pluginWidget) {
   plugin_widget_ = static_cast<WebPluginContainerImpl*>(pluginWidget);
   DCHECK(plugin_widget_.get());
 }
 
@@ skipping 91 matching lines @@
   WebViewImpl* webview = webframe_->GetWebViewImpl();
   if (webview->client())
     webview->client()->navigateBackForwardSoon(offset);
 }
 
 PassOwnPtr<WebPluginLoadObserver> WebFrameLoaderClient::GetPluginLoadObserver() {
   WebDataSourceImpl* ds = WebDataSourceImpl::fromDocumentLoader(
       webframe_->frame()->loader()->activeDocumentLoader());
   return ds->releasePluginLoadObserver();
 }