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 6f4cc372cb86ad73f9388740e5a9f0c05652cc88..1e55e973eea49df429d0dc229d0bb33345f64449 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"
@@ -381,11 +380,6 @@
 #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();