Do not delete blink::WebRTCCertificateCallback on non-main thread

base/sequenced_task_runner.cc

Index: base/sequenced_task_runner.cc
diff --git a/base/sequenced_task_runner.cc b/base/sequenced_task_runner.cc
index 00d404881597a1d1c65efd0939523f80e15e68b4..1bbcb9df399705b12e22eafcb91a2e5048459240 100644
--- a/base/sequenced_task_runner.cc
+++ b/base/sequenced_task_runner.cc
@@ -28,4 +28,17 @@ bool SequencedTaskRunner::ReleaseSoonInternal(
   return PostNonNestableTask(from_here, Bind(releaser, object));
 }
 
+OnTaskRunnerDeleter::OnTaskRunnerDeleter(
+    scoped_refptr<SequencedTaskRunner> task_runner)
+    : task_runner_(std::move(task_runner)) {
+}
+
+OnTaskRunnerDeleter::~OnTaskRunnerDeleter() {
+}
+
+OnTaskRunnerDeleter::OnTaskRunnerDeleter(OnTaskRunnerDeleter&&) = default;
+
+OnTaskRunnerDeleter& OnTaskRunnerDeleter::operator=(
+    OnTaskRunnerDeleter&&) = default;
+
 }  // namespace base