Update from https://crrev.com/307330

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index e7612a0138c39b4f0e30edea4be6ca4e613d1f5d..738326a4d7d9440d2ec9e23cfd7557ee1a418ec1 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -10,6 +10,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/rand_util.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
@@ -40,9 +41,6 @@
 #include "base/win/windows_version.h"
 #endif
 
-using std::string;
-using std::vector;
-
 namespace net {
 
 namespace {
@@ -294,6 +292,11 @@ int QuicStreamFactory::Job::DoLoop(int rv) {
 }
 
 void QuicStreamFactory::Job::OnIOComplete(int rv) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "436634 QuicStreamFactory::Job::OnIOComplete"));
+
   rv = DoLoop(rv);
 
   if (rv != ERR_IO_PENDING && !callback_.is_null()) {