[tracing] Make memory-infra unregristration DCHECK stricter

components/tracing/child_trace_message_filter_browsertest.cc

Index: components/tracing/child_trace_message_filter_browsertest.cc
diff --git a/components/tracing/child_trace_message_filter_browsertest.cc b/components/tracing/child_trace_message_filter_browsertest.cc
index 011b556aa2d9feab047a18585ad025d377a77e4a..26a36064ee1357d2749a6e165a1e21bd22af6eb3 100644
--- a/components/tracing/child_trace_message_filter_browsertest.cc
+++ b/components/tracing/child_trace_message_filter_browsertest.cc
@@ -52,7 +52,8 @@ class ChildTracingTest : public content::RenderViewTest, public IPC::Listener {
     // registered itself by now; this cannot be prevented easily.
     mock_dump_provider_.reset(new MockDumpProvider());
     MemoryDumpManager::GetInstance()->RegisterDumpProvider(
-        mock_dump_provider_.get(), "MockDumpProvider", nullptr);
+        mock_dump_provider_.get(), "MockDumpProvider",
+        base::ThreadTaskRunnerHandle::Get());
     MemoryDumpManager::GetInstance()
         ->set_dumper_registrations_ignored_for_testing(true);