Rewrite base::Bind into base::BindOnce on trivial cases in base

base/trace_event/trace_event_system_stats_monitor.cc

Index: base/trace_event/trace_event_system_stats_monitor.cc
diff --git a/base/trace_event/trace_event_system_stats_monitor.cc b/base/trace_event/trace_event_system_stats_monitor.cc
index 03ef5a67fdab91de29f905c29028cc5b152be49b..52e1cdcc3d9f16f6f34cd2bd9a2f30193eb3bbfb 100644
--- a/base/trace_event/trace_event_system_stats_monitor.cc
+++ b/base/trace_event/trace_event_system_stats_monitor.cc
@@ -79,16 +79,14 @@ void TraceEventSystemStatsMonitor::OnTraceLogEnabled() {
   if (!enabled)
     return;
   task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&TraceEventSystemStatsMonitor::StartProfiling,
-                 weak_factory_.GetWeakPtr()));
+      FROM_HERE, base::BindOnce(&TraceEventSystemStatsMonitor::StartProfiling,
+                                weak_factory_.GetWeakPtr()));
 }
 
 void TraceEventSystemStatsMonitor::OnTraceLogDisabled() {
   task_runner_->PostTask(
-      FROM_HERE,
-      base::Bind(&TraceEventSystemStatsMonitor::StopProfiling,
-                 weak_factory_.GetWeakPtr()));
+      FROM_HERE, base::BindOnce(&TraceEventSystemStatsMonitor::StopProfiling,
+                                weak_factory_.GetWeakPtr()));
 }
 
 void TraceEventSystemStatsMonitor::StartProfiling() {