Standardize "net" category trace events

net/http/http_stream_factory_impl_job.cc

Index: net/http/http_stream_factory_impl_job.cc
diff --git a/net/http/http_stream_factory_impl_job.cc b/net/http/http_stream_factory_impl_job.cc
index 3190b9141ad97b6d216a1b1295f3edaa475375ab..03e46d05dbe9f71885d89a1c619ddd1d19970826 100644
--- a/net/http/http_stream_factory_impl_job.cc
+++ b/net/http/http_stream_factory_impl_job.cc
@@ -38,6 +38,7 @@
 #include "net/log/net_log_event_type.h"
 #include "net/log/net_log_source.h"
 #include "net/log/net_log_source_type.h"
+#include "net/log/trace_constants.h"
 #include "net/quic/chromium/quic_http_stream.h"
 #include "net/socket/client_socket_handle.h"
 #include "net/socket/client_socket_pool.h"
@@ -500,14 +501,12 @@ int HttpStreamFactoryImpl::Job::OnHostResolution(
 }
 
 void HttpStreamFactoryImpl::Job::OnIOComplete(int result) {
-  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"),
-               "HttpStreamFactoryImpl::Job::OnIOComplete");
+  TRACE_EVENT0(kNetTracingCategory, "HttpStreamFactoryImpl::Job::OnIOComplete");
   RunLoop(result);
 }
 
 int HttpStreamFactoryImpl::Job::RunLoop(int result) {
-  TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("net"),
-               "HttpStreamFactoryImpl::Job::RunLoop");
+  TRACE_EVENT0(kNetTracingCategory, "HttpStreamFactoryImpl::Job::RunLoop");
   result = DoLoop(result);
 
   if (result == ERR_IO_PENDING)