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, \

[Dan Beam, 2015/06/08 21:10:30]

p.s. there's only 1 other use of this
https://code.google.com/p/chromium/codesearch#chromium/src/net/log/trace_net_...

/if/ the params sent at the end don't matter so much, we should probably try to
remove this to discourage passing around useless params and make it clearer they
aren't necessary.

         arg1_val, arg2_name, arg2_val) \
     INTERNAL_TRACE_EVENT_ADD_WITH_ID(TRACE_EVENT_PHASE_NESTABLE_ASYNC_END, \