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

remoting/host/heartbeat_sender.cc

Index: remoting/host/heartbeat_sender.cc
diff --git a/remoting/host/heartbeat_sender.cc b/remoting/host/heartbeat_sender.cc
index 589eb312eb5f98947f3d0331201111d824b74e5c..c5027da5665a6f537f941241eb671dfd41210823 100644
--- a/remoting/host/heartbeat_sender.cc
+++ b/remoting/host/heartbeat_sender.cc
@@ -78,7 +78,7 @@ void HeartbeatSender::OnSignallingConnected(SignalStrategy* signal_strategy,
 
   DoSendStanza();
   timer_.Start(base::TimeDelta::FromMilliseconds(interval_ms_), this,
-               &HeartbeatSender::DoSendStanza);
+               &HeartbeatSender::DoSendStanza, FROM_HERE);
 }
 
 void HeartbeatSender::OnSignallingDisconnected() {
@@ -144,7 +144,7 @@ void HeartbeatSender::SetInterval(int interval) {
     if (state_ == STARTED) {
       timer_.Stop();
       timer_.Start(base::TimeDelta::FromMilliseconds(interval_ms_), this,
-                   &HeartbeatSender::DoSendStanza);
+                   &HeartbeatSender::DoSendStanza, FROM_HERE);
     }
   }
 }