Remove usage of FOR_EACH_OBSERVER macro in remoting

remoting/signaling/fake_signal_strategy.cc

Index: remoting/signaling/fake_signal_strategy.cc
diff --git a/remoting/signaling/fake_signal_strategy.cc b/remoting/signaling/fake_signal_strategy.cc
index 69af43d7ba14521f358ec19a8093b614836a75ae..fffc047661422acb6e9c090de04f43c834579e63 100644
--- a/remoting/signaling/fake_signal_strategy.cc
+++ b/remoting/signaling/fake_signal_strategy.cc
@@ -65,14 +65,14 @@ void FakeSignalStrategy::SetLocalJid(const std::string& jid) {
 
 void FakeSignalStrategy::Connect() {
   DCHECK(CalledOnValidThread());
-  FOR_EACH_OBSERVER(Listener, listeners_,
-                    OnSignalStrategyStateChange(CONNECTED));
+  for (auto& observer : listeners_)
+    observer.OnSignalStrategyStateChange(CONNECTED);
 }
 
 void FakeSignalStrategy::Disconnect() {
   DCHECK(CalledOnValidThread());
-  FOR_EACH_OBSERVER(Listener, listeners_,
-                    OnSignalStrategyStateChange(DISCONNECTED));
+  for (auto& observer : listeners_)
+    observer.OnSignalStrategyStateChange(DISCONNECTED);
 }
 
 SignalStrategy::State FakeSignalStrategy::GetState() const {