Revert of Make flow event traces disabled-by-default, and rename "ipc" and "task"

base/debug/trace_event_memory.cc

Index: base/debug/trace_event_memory.cc
diff --git a/base/debug/trace_event_memory.cc b/base/debug/trace_event_memory.cc
index 3c468278a15bcce12787067053adc1482bd8e92c..4b2b050df8e18116d1021b821c01af9b3d0c905b 100644
--- a/base/debug/trace_event_memory.cc
+++ b/base/debug/trace_event_memory.cc
@@ -409,9 +409,9 @@
 
     // TODO(jamescook): Report the trace category and name separately to the
     // trace viewer and allow it to decide what decorations to apply. For now
-    // just hard-code a decoration for posted tasks (toplevel).
+    // just hard-code a decoration for posted tasks.
     std::string trace_string(trace_name);
-    if (!strcmp(trace_category, "toplevel"))
+    if (!strcmp(trace_category, "task"))
       trace_string.append("->PostTask");
 
     // Some trace name strings have double quotes, convert them to single.