Update base/timer.h code to pass through Location from call sites.

net/socket/client_socket_pool_base.cc

Index: net/socket/client_socket_pool_base.cc
diff --git a/net/socket/client_socket_pool_base.cc b/net/socket/client_socket_pool_base.cc
index 24966c05ec809cef02376f0812de6adc94969563..231562a1fe9b439e6bdbd02ab2966ab64db64511 100644
--- a/net/socket/client_socket_pool_base.cc
+++ b/net/socket/client_socket_pool_base.cc
@@ -90,7 +90,7 @@ void ConnectJob::Initialize(bool is_preconnect) {
 
 int ConnectJob::Connect() {
   if (timeout_duration_ != base::TimeDelta())
-    timer_.Start(timeout_duration_, this, &ConnectJob::OnTimeout);
+    timer_.Start(timeout_duration_, this, &ConnectJob::OnTimeout, FROM_HERE);
 
   idle_ = false;
 
@@ -131,7 +131,7 @@ void ConnectJob::NotifyDelegateOfCompletion(int rv) {
 
 void ConnectJob::ResetTimer(base::TimeDelta remaining_time) {
   timer_.Stop();
-  timer_.Start(remaining_time, this, &ConnectJob::OnTimeout);
+  timer_.Start(remaining_time, this, &ConnectJob::OnTimeout, FROM_HERE);
 }
 
 void ConnectJob::LogConnectStart() {
@@ -698,7 +698,7 @@ void ClientSocketPoolBaseHelper::EnableConnectBackupJobs() {
 void ClientSocketPoolBaseHelper::IncrementIdleCount() {
   if (++idle_socket_count_ == 1)
     timer_.Start(TimeDelta::FromSeconds(kCleanupInterval), this,
-                 &ClientSocketPoolBaseHelper::OnCleanupTimerFired);
+                 &ClientSocketPoolBaseHelper::OnCleanupTimerFired, FROM_HERE);
 }
 
 void ClientSocketPoolBaseHelper::DecrementIdleCount() {