Forcibly clear worker ref counts on shutdown.

chrome/browser/browsing_data/hosted_apps_counter_unittest.cc

 // Copyright 2016 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/hosted_apps_counter.h"
 
 #include <algorithm>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/guid.h"
 #include "base/values.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/browsing_data/core/browsing_data_utils.h"
 #include "components/browsing_data/core/pref_names.h"
 #include "components/crx_file/id_util.h"
 #include "components/prefs/pref_service.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "extensions/browser/extension_registry.h"
 #include "extensions/common/extension_builder.h"
 #include "extensions/common/value_builder.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 using extensions::DictionaryBuilder;
 using extensions::ListBuilder;
 
@@ skipping 101 matching lines @@
     }
   }
 
   // Miscellaneous. ------------------------------------------------------------
 
   Profile* GetProfile() {
     return profile_.get();
   }
 
  private:
-  base::MessageLoop loop_;
+  content::TestBrowserThreadBundle thread_bundle_;
   std::unique_ptr<TestingProfile> profile_;
   extensions::ExtensionRegistry* extension_registry_;
 
   bool finished_;
   browsing_data::BrowsingDataCounter::ResultInt num_apps_;
   std::vector<std::string> examples_;
 };
 
 // Tests that we count the total number of hosted apps correctly.
 TEST_F(HostedAppsCounterTest, Count) {
@@ skipping 79 matching lines @@
   EXPECT_EQ("App 2", GetExamples().back());
 
   AddHostedAppWithName("App 3");
   counter.Restart();
   EXPECT_EQ(2u, GetExamples().size());
   EXPECT_EQ("App 1", GetExamples().front());
   EXPECT_EQ("App 2", GetExamples().back());
 }
 
 }  // namespace