Use ThreadData::Now() for TrackingInfo::time_posted initialization

content/renderer/scheduler/task_queue_manager.cc

Index: content/renderer/scheduler/task_queue_manager.cc
diff --git a/content/renderer/scheduler/task_queue_manager.cc b/content/renderer/scheduler/task_queue_manager.cc
index c2b42808d72bfbd0708c575a92abc1107196f506..eed64494175b782cb816212a84c357f50fcae7e9 100644
--- a/content/renderer/scheduler/task_queue_manager.cc
+++ b/content/renderer/scheduler/task_queue_manager.cc
@@ -231,9 +231,6 @@ void TaskQueue::TaskAsValueInto(const base::PendingTask& task,
   state->SetBoolean("nestable", task.nestable);
   state->SetBoolean("is_high_res", task.is_high_res);
   state->SetDouble(
-      "time_posted",
-      (task.time_posted - base::TimeTicks()).InMicroseconds() / 1000.0L);
-  state->SetDouble(
       "delayed_run_time",
       (task.delayed_run_time - base::TimeTicks()).InMicroseconds() / 1000.0L);
   state->EndDictionary();