Add debuggin CHECK to help track down ExtensionHost crasher

chrome/browser/extensions/extension_host.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_host.h"
 
 #include <list>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 138 matching lines @@
                  Source<Profile>(profile_));
 }
 
 ExtensionHost::~ExtensionHost() {
   NotificationService::current()->Notify(
       NotificationType::EXTENSION_HOST_DESTROYED,
       Source<Profile>(profile_),
       Details<ExtensionHost>(this));
   ProcessCreationQueue::get()->Remove(this);
   render_view_host_->Shutdown();  // deletes render_view_host
+
+  if (recently_deleted()->size() >= 20)
+    recently_deleted()->pop_front();
+  recently_deleted()->push_back(this);
+}
+
+ExtensionHost::HostPointerList* ExtensionHost::recently_deleted() {
+  return Singleton<HostPointerList>::get();
 }
 
 void ExtensionHost::CreateView(Browser* browser) {
 #if defined(TOOLKIT_VIEWS)
   view_.reset(new ExtensionView(this, browser));
   // We own |view_|, so don't auto delete when it's removed from the view
   // hierarchy.
   view_->set_parent_owned(false);
 #elif defined(OS_MACOSX)
   view_.reset(new ExtensionViewMac(this, browser));
@@ skipping 562 matching lines @@
     // Extensions hosted in ExternalTabContainer objects may not have
     // an associated browser.
     Browser* browser = GetBrowser();
     if (browser)
       window_id = ExtensionTabUtil::GetWindowId(browser);
   } else if (extension_host_type_ != ViewType::EXTENSION_BACKGROUND_PAGE) {
     NOTREACHED();
   }
   return window_id;
 }