Browsing Data Deletion: Style fixes

chrome/browser/browsing_data/mock_browsing_data_appcache_helper.cc

 // Copyright (c) 2012 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/browsing_data/mock_browsing_data_appcache_helper.h"
 
 #include "base/callback.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 MockBrowsingDataAppCacheHelper::MockBrowsingDataAppCacheHelper(
   Profile* profile)
   : BrowsingDataAppCacheHelper(profile) {
 }
 
 MockBrowsingDataAppCacheHelper::~MockBrowsingDataAppCacheHelper() {
 }
 
 void MockBrowsingDataAppCacheHelper::StartFetching(
     const base::Closure& completion_callback) {
+  ASSERT_FALSE(completion_callback.is_null());
+  ASSERT_TRUE(completion_callback_.is_null());
   completion_callback_ = completion_callback;
 }
 
 void MockBrowsingDataAppCacheHelper::DeleteAppCacheGroup(
     const GURL& manifest_url) {
 }