[scheduler]: Avoid waking up the scheduler to end long idle periods.

components/scheduler/child/null_idle_task_runner.cc

Index: components/scheduler/child/null_idle_task_runner.cc
diff --git a/components/scheduler/child/null_idle_task_runner.cc b/components/scheduler/child/null_idle_task_runner.cc
index 9d11e7c565f35095d7805ab1c26f184b36343e4d..934b3492c9ce5bd65aeeccd082c518883f5d2217 100644
--- a/components/scheduler/child/null_idle_task_runner.cc
+++ b/components/scheduler/child/null_idle_task_runner.cc
@@ -7,10 +7,7 @@
 namespace scheduler {
 
 NullIdleTaskRunner::NullIdleTaskRunner()
-    : SingleThreadIdleTaskRunner(nullptr,
-                                 nullptr,
-                                 base::Callback<void(base::TimeTicks*)>(),
-                                 "null.taskrunner") {
+    : SingleThreadIdleTaskRunner(nullptr, nullptr, nullptr, "null.taskrunner") {
 }
 
 NullIdleTaskRunner::~NullIdleTaskRunner() {