Make sure that pointer to the ExtensionsService is valid in the extensions infobars.

chrome/browser/extensions/crashed_extension_infobar.cc

 // Copyright (c) 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/crashed_extension_infobar.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/common/extensions/extension.h"
 #include "grit/browser_resources.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 
 CrashedExtensionInfoBarDelegate::CrashedExtensionInfoBarDelegate(
     TabContents* tab_contents,
     ExtensionsService* extensions_service,
     const Extension* extension)
     : ConfirmInfoBarDelegate(tab_contents),
       extensions_service_(extensions_service),
       extension_id_(extension->id()),
       extension_name_(extension->name()) {
-  DCHECK(extensions_service_);
+  DCHECK(extensions_service_.get());
   DCHECK(!extension_id_.empty());
 }
 
+CrashedExtensionInfoBarDelegate::~CrashedExtensionInfoBarDelegate() {
+}
+
 std::wstring CrashedExtensionInfoBarDelegate::GetMessageText() const {
   return l10n_util::GetStringF(IDS_EXTENSION_CRASHED_INFOBAR_MESSAGE,
       UTF8ToWide(extension_name_));
 }
 
 void CrashedExtensionInfoBarDelegate::InfoBarClosed() {
   delete this;
 }
 
 SkBitmap* CrashedExtensionInfoBarDelegate::GetIcon() const {
@@ skipping 10 matching lines @@
     ConfirmInfoBarDelegate::InfoBarButton button) const {
   if (button == BUTTON_OK)
     return l10n_util::GetString(IDS_EXTENSION_CRASHED_INFOBAR_RESTART_BUTTON);
   return ConfirmInfoBarDelegate::GetButtonLabel(button);
 }
 
 bool CrashedExtensionInfoBarDelegate::Accept() {
   extensions_service_->ReloadExtension(extension_id_);
   return true;
 }