Simplify file tracing end events.

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 6fdbf41ca4658bd83ab39d29e9de5cbe9d82fbf6..397bafc3550faf11c3bae4a1b5b4576bb81c9efb 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -731,16 +731,12 @@
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val, \
         arg2_name, arg2_val)
-// Records a single NESTABLE_ASYNC_END event called "name" immediately, with 0,
-// 1, or 2 associated arguments. If the category is not enabled, then this does
+// Records a single NESTABLE_ASYNC_END event called "name" immediately, with 0
+// or 2 associated arguments. If the category is not enabled, then this does
 // nothing.
 #define TRACE_EVENT_NESTABLE_ASYNC_END0(category_group, name, id) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
         category_group, name, id, TRACE_EVENT_FLAG_NONE)
-#define TRACE_EVENT_NESTABLE_ASYNC_END1(category_group, name, id, arg1_name, \
-        arg1_val) \
-    INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \
-        category_group, name, id, TRACE_EVENT_FLAG_NONE, arg1_name, arg1_val)
 #define TRACE_EVENT_NESTABLE_ASYNC_END2(category_group, name, id, arg1_name, \
         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \