Create and remove |UiDevToolsServer::server_| in the same thread.

components/ui_devtools/devtools_server.cc

Index: components/ui_devtools/devtools_server.cc
diff --git a/components/ui_devtools/devtools_server.cc b/components/ui_devtools/devtools_server.cc
index c8fd76c15f1bbb4aa29ed94ce537c75446a43eb1..a901f937e988058a5726e291691e10655ed2eae5 100644
--- a/components/ui_devtools/devtools_server.cc
+++ b/components/ui_devtools/devtools_server.cc
@@ -65,6 +65,10 @@ UiDevToolsServer::UiDevToolsServer(
 }
 
 UiDevToolsServer::~UiDevToolsServer() {
+  if (io_thread_task_runner_)
+    io_thread_task_runner_->DeleteSoon(FROM_HERE, server_.release());
+  if (thread_ && thread_->IsRunning())
+    thread_->Stop();
   devtools_server_ = nullptr;
 }