Revert of Disallow posting tasks to SequencedWorkerPools by default.

base/test/test_suite.cc

Index: base/test/test_suite.cc
diff --git a/base/test/test_suite.cc b/base/test/test_suite.cc
index aaaf8c1b0ac31caa7734f80e423898a1cea412d4..a56dc59fecceff86f96180938be3049414e62c32 100644
--- a/base/test/test_suite.cc
+++ b/base/test/test_suite.cc
@@ -31,7 +31,6 @@
 #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"
@@ -370,11 +369,6 @@
 #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();