Revert of Disallow posting tasks to SequencedWorkerPools by default.

base/test/test_suite.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 "base/test/test_suite.h"
 
 #include <memory>
 
 #include "base/at_exit.h"
 #include "base/base_paths.h"
@@ skipping 13 matching lines @@
 #include "base/path_service.h"
 #include "base/process/launch.h"
 #include "base/process/memory.h"
 #include "base/test/gtest_xml_unittest_result_printer.h"
 #include "base/test/gtest_xml_util.h"
 #include "base/test/icu_test_util.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/multiprocess_test.h"
 #include "base/test/test_switches.h"
 #include "base/test/test_timeouts.h"
-#include "base/threading/sequenced_worker_pool.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/multiprocess_func_list.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_nsautorelease_pool.h"
 #if defined(OS_IOS)
 #include "base/test/test_listener_ios.h"
@@ skipping 318 matching lines @@
 #if !defined(OS_WIN)
 #if defined(OS_IOS)
   i18n::SetICUDefaultLocale("en_US");
 #else
   std::string default_locale(uloc_getDefault());
   if (EndsWith(default_locale, "POSIX", CompareCase::INSENSITIVE_ASCII))
     i18n::SetICUDefaultLocale("en_US");
 #endif
 #endif
 
-  // Enable SequencedWorkerPool in tests.
-  // TODO(fdoray): Remove this once the SequencedWorkerPool to TaskScheduler
-  // redirection experiment concludes https://crbug.com/622400.
-  SequencedWorkerPool::EnableForProcess();
-
   CatchMaybeTests();
   ResetCommandLine();
   AddTestLauncherResultPrinter();
 
   TestTimeouts::Initialize();
 
   trace_to_file_.BeginTracingFromCommandLineOptions();
 
   base::debug::StartProfiling(GetProfileName());
 }
 
 void TestSuite::Shutdown() {
   base::debug::StopProfiling();
 
   // Clear the FeatureList that was created by Initialize().
   if (created_feature_list_)
     FeatureList::ClearInstanceForTesting();
 }
 
 }  // namespace base