Ensure tests have an active task runner

chrome/browser/password_manager/password_manager_metrics_util_unittest.cc

 // Copyright 2013 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 "components/password_manager/core/browser/password_manager_metrics_util.h"
 
 #include <iterator>
 #include <map>
 
 #include "base/basictypes.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/values.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/password_manager/core/common/password_manager_pref_names.h"
+#include "content/public/test/test_browser_thread_bundle.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class PasswordManagerMetricsUtilTest : public testing::Test {
  public:
   PasswordManagerMetricsUtilTest() {}
 
  protected:
   bool IsMonitored(const char* url_host) {
     size_t group_id = password_manager::metrics_util::MonitoredDomainGroupId(
         url_host, profile_.GetPrefs());
     return group_id > 0;
   }
 
+  content::TestBrowserThreadBundle thread_bundle_;
   TestingProfile profile_;
 };
 
 TEST_F(PasswordManagerMetricsUtilTest, MonitoredDomainGroupAssigmentTest) {
   const char* const kMonitoredWebsites[] = {
       "https://www.google.com",
       "https://www.yahoo.com",
       "https://www.baidu.com",
       "https://www.wikipedia.org",
       "https://www.linkedin.com",
@@ skipping 34 matching lines @@
   }
 }
 
 TEST_F(PasswordManagerMetricsUtilTest, MonitoredDomainGroupTest) {
   EXPECT_TRUE(IsMonitored("https://www.linkedin.com"));
   EXPECT_TRUE(IsMonitored("https://www.amazon.com"));
   EXPECT_TRUE(IsMonitored("https://www.facebook.com"));
   EXPECT_TRUE(IsMonitored("http://wikipedia.org"));
   EXPECT_FALSE(IsMonitored("http://thisisnotwikipedia.org"));
 }