Add debuggin CHECK to help track down ExtensionHost crasher

chrome/browser/extensions/extension_host.h

 // Copyright (c) 2010 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #pragma once
 
 #include <string>
+#include <list>
 
 #include "base/perftimer.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/browser/jsmessage_box_client.h"
 #include "chrome/browser/renderer_host/render_view_host_delegate.h"
 #include "chrome/browser/tab_contents/render_view_host_delegate_helper.h"
 #if defined(TOOLKIT_VIEWS)
 #include "chrome/browser/views/extensions/extension_view.h"
 #elif defined(OS_MACOSX)
@@ skipping 21 matching lines @@
                       public RenderViewHostDelegate::View,
                       public ExtensionFunctionDispatcher::Delegate,
                       public NotificationObserver,
                       public JavaScriptMessageBoxClient {
  public:
   class ProcessCreationQueue;
 
   // Enable DOM automation in created render view hosts.
   static void EnableDOMAutomation() { enable_dom_automation_ = true; }
 
+  typedef std::list<ExtensionHost*> HostPointerList;
+  static HostPointerList* recently_deleted();
+
   ExtensionHost(Extension* extension, SiteInstance* site_instance,
                 const GURL& url, ViewType::Type host_type);
   ~ExtensionHost();
 
 #if defined(TOOLKIT_VIEWS)
   void set_view(ExtensionView* view) { view_.reset(view); }
   ExtensionView* view() const { return view_.get(); }
 #elif defined(OS_MACOSX)
   ExtensionViewMac* view() const { return view_.get(); }
 #elif defined(TOOLKIT_GTK)
@@ skipping 209 matching lines @@
   // The relevant TabContents associated with this ExtensionHost, if any.
   TabContents* associated_tab_contents_;
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_