Enable redirection of SequencedWorkerPool to TaskScheduler in TestBrowserThreadBundle.

content/public/test/test_browser_thread_bundle.cc

Index: content/public/test/test_browser_thread_bundle.cc
diff --git a/content/public/test/test_browser_thread_bundle.cc b/content/public/test/test_browser_thread_bundle.cc
index fa852124094dba6f75e1b1249fbb0ea098237107..6d0d4df247aa903f03e905790b2a0c178f7a84e3 100644
--- a/content/public/test/test_browser_thread_bundle.cc
+++ b/content/public/test/test_browser_thread_bundle.cc
@@ -10,6 +10,7 @@
 #include "base/run_loop.h"
 #include "base/task_scheduler/task_scheduler.h"
 #include "base/test/scoped_async_task_scheduler.h"
+#include "base/threading/sequenced_worker_pool.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_browser_thread.h"
@@ -78,6 +79,12 @@ TestBrowserThreadBundle::~TestBrowserThreadBundle() {
   // for DestructionObservers hooked to |message_loop_| to be able to invoke
   // BrowserThread::CurrentlyOn() -- ref. ~TestBrowserThread().
   message_loop_.reset();
+
+  // Disable redirection of SequencedWorkerPools to TaskScheduler. This is
+  // required in order to reset global state so that tests following this one in
+  // this process can still manage their own SequencedWorkerPool without using
+  // TestBrowserThreadBundle.
+  base::SequencedWorkerPool::EnableForProcess();
 }
 
 void TestBrowserThreadBundle::Init() {
@@ -123,6 +130,9 @@ void TestBrowserThreadBundle::CreateThreads() {
         base::MakeUnique<base::test::ScopedAsyncTaskScheduler>();
   }
 
+  // Enable redirection of SequencedWorkerPools to TaskScheduler.
+  base::SequencedWorkerPool::EnableWithRedirectionToTaskSchedulerForProcess();
+
   if (options_ & REAL_DB_THREAD) {
     db_thread_ = base::MakeUnique<TestBrowserThread>(BrowserThread::DB);
     db_thread_->Start();