Supervised users: Post blocking pool tasks with CONTINUE_SHUTDOWN behavior.

chrome/browser/supervised_user/supervised_user_url_filter.cc

Index: chrome/browser/supervised_user/supervised_user_url_filter.cc
diff --git a/chrome/browser/supervised_user/supervised_user_url_filter.cc b/chrome/browser/supervised_user/supervised_user_url_filter.cc
index c75039b885d94d6d0fa4b2abb3212595acb6860d..d9b641c216d9e185784c98ceb5e7ffa4391f8240 100644
--- a/chrome/browser/supervised_user/supervised_user_url_filter.cc
+++ b/chrome/browser/supervised_user/supervised_user_url_filter.cc
@@ -165,7 +165,10 @@ SupervisedUserURLFilter::SupervisedUserURLFilter()
     : default_behavior_(ALLOW),
       contents_(new Contents()),
       blacklist_(nullptr),
-      blocking_task_runner_(BrowserThread::GetBlockingPool()) {
+      blocking_task_runner_(
+          BrowserThread::GetBlockingPool()
+              ->GetTaskRunnerWithShutdownBehavior(
+                  base::SequencedWorkerPool::CONTINUE_ON_SHUTDOWN).get()) {
   // Detach from the current thread so we can be constructed on a different
   // thread than the one where we're used.
   DetachFromThread();