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..c7b16e07d124618a792835635aaa19370e976474 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_->IsRunning())

[sadrul, 2017/06/28 04:49:10]

You should check if |thread|_ is non-null first.

[thanhph, 2017/06/28 14:38:22]

Done.

+    thread_->Stop();
   devtools_server_ = nullptr;
 }