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

base/message_loop/message_loop_unittest.cc

Index: base/message_loop/message_loop_unittest.cc
diff --git a/base/message_loop/message_loop_unittest.cc b/base/message_loop/message_loop_unittest.cc
index 733f5e5b51080b2059a646c8eb6ee3a35b22afe9..ccf79c05b7597f11d0cd28b81e71b805aee92727 100644
--- a/base/message_loop/message_loop_unittest.cc
+++ b/base/message_loop/message_loop_unittest.cc
@@ -668,14 +668,12 @@ class DummyTaskObserver : public MessageLoop::TaskObserver {
 
   void WillProcessTask(const PendingTask& pending_task) override {
     num_tasks_started_++;
-    EXPECT_TRUE(pending_task.time_posted != TimeTicks());
     EXPECT_LE(num_tasks_started_, num_tasks_);
     EXPECT_EQ(num_tasks_started_, num_tasks_processed_ + 1);
   }
 
   void DidProcessTask(const PendingTask& pending_task) override {
     num_tasks_processed_++;
-    EXPECT_TRUE(pending_task.time_posted != TimeTicks());
     EXPECT_LE(num_tasks_started_, num_tasks_);
     EXPECT_EQ(num_tasks_started_, num_tasks_processed_);
   }