Add debuggin CHECK to help track down ExtensionHost crasher

chrome/browser/extensions/extension_host.h

Index: chrome/browser/extensions/extension_host.h
diff --git a/chrome/browser/extensions/extension_host.h b/chrome/browser/extensions/extension_host.h
index a2ad3d68c0e3af681196a0ee2541bfb0c8fe2735..245e539f8e9ff9f5aab6a17a6c662dc0900bd3b6 100644
--- a/chrome/browser/extensions/extension_host.h
+++ b/chrome/browser/extensions/extension_host.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <string>
+#include <list>
 
 #include "base/perftimer.h"
 #include "base/scoped_ptr.h"
@@ -48,6 +49,9 @@ class ExtensionHost : public RenderViewHostDelegate,
   // 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();