Revert of Add DeadlineOverrun step to the RendererSchedulerIdlePeriod trace event.

base/trace_event/trace_event.h

Index: base/trace_event/trace_event.h
diff --git a/base/trace_event/trace_event.h b/base/trace_event/trace_event.h
index cbb0daaa505aa53fdf6611c71e447ddffe608d24..7f73071de27b06c41c0083ce244e0798d81a2171 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -595,15 +595,6 @@
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_ASYNC_STEP_INTO, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, "step", step, \
         arg1_name, arg1_val)
-
-// Similar to TRACE_EVENT_ASYNC_STEP_INTOx but with a custom |at| timestamp
-// provided.
-#define TRACE_EVENT_ASYNC_STEP_INTO_WITH_TIMESTAMP0(category_group, name, \
-        id, step, timestamp) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID_TID_AND_TIMESTAMP( \
-        TRACE_EVENT_PHASE_ASYNC_STEP_INTO, category_group, name, id, \
-        static_cast<int>(base::PlatformThread::CurrentId()), \
-        timestamp, TRACE_EVENT_FLAG_NONE, "step", step)
 
 // Records a single ASYNC_STEP_PAST event for |step| immediately. If the
 // category is not enabled, then this does nothing. The |name| and |id| must