Properly restart extensions with no visible UI.

chrome/browser/extensions/extension_host.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 "chrome/browser/extensions/extension_host.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "base/string_util.h"
 #include "chrome/browser/browser.h"
@@ skipping 117 matching lines @@
 
 void ExtensionHost::CreateRenderView(RenderWidgetHostView* host_view) {
   render_view_host_->set_view(host_view);
   render_view_host_->CreateRenderView();
   render_view_host_->NavigateToURL(url_);
 }
 
 void ExtensionHost::RecoverCrashedExtension() {
   DCHECK(!IsRenderViewLive());
 #if defined(TOOLKIT_VIEWS)
-  view_->RecoverCrashedExtension();
+  if (view_.get()) {
+    view_->RecoverCrashedExtension();
+  } else {
+    CreateRenderView(NULL);
+  }
+#else
+  CreateRenderView(NULL);
 #endif
   if (IsRenderViewLive()) {
     NotificationService::current()->Notify(
         NotificationType::EXTENSION_PROCESS_RESTORED,
         Source<Profile>(profile_),
         Details<ExtensionHost>(this));
   }
 }
 
 void ExtensionHost::UpdatePreferredWidth(int pref_width) {
@@ skipping 162 matching lines @@
   // A similar situation may arise during shutdown.
   // TODO(rafaelw): Delay creation of background_page until the browser
   // is available. http://code.google.com/p/chromium/issues/detail?id=13284
   return browser;
 }
 
 void ExtensionHost::RenderViewCreated(RenderViewHost* render_view_host) {
   extension_function_dispatcher_.reset(
       new ExtensionFunctionDispatcher(render_view_host_, this, url_));
 }