Do not delete synchronously in OnTaskRunnerDeleter.

base/sequenced_task_runner.h

Index: base/sequenced_task_runner.h
diff --git a/base/sequenced_task_runner.h b/base/sequenced_task_runner.h
index 0bedf2e1b9251190b09dd3a409a4db4689f3e81c..de91bd9285b2f35fd952642e9439d8e35935b331 100644
--- a/base/sequenced_task_runner.h
+++ b/base/sequenced_task_runner.h
@@ -163,9 +163,7 @@ struct BASE_EXPORT OnTaskRunnerDeleter {
 
   template <typename T>
   void operator()(const T* ptr) {
-    if (task_runner_->RunsTasksOnCurrentThread())
-      delete ptr;
-    else if (ptr)
+    if (ptr)
       task_runner_->DeleteSoon(FROM_HERE, ptr);
   }