Remove unnecessary instrumentation for several jank bugs.

net/ftp/ftp_network_transaction.cc

Index: net/ftp/ftp_network_transaction.cc
diff --git a/net/ftp/ftp_network_transaction.cc b/net/ftp/ftp_network_transaction.cc
index 814be921f3eba4c75313536384662d0b46f7af71..5732c646c0604969a8a20ba2c02696aa974b92f3 100644
--- a/net/ftp/ftp_network_transaction.cc
+++ b/net/ftp/ftp_network_transaction.cc
@@ -8,7 +8,6 @@
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/metrics/histogram.h"
-#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ -362,11 +361,6 @@ void FtpNetworkTransaction::DoCallback(int rv) {
 }
 
 void FtpNetworkTransaction::OnIOComplete(int result) {
-  // TODO(vadimt): Remove ScopedTracker below once crbug.com/436634 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
-      FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "436634 FtpNetworkTransaction::OnIOComplete"));
-
   int rv = DoLoop(result);
   if (rv != ERR_IO_PENDING)
     DoCallback(rv);