Remove usage of base::ObserverList<T>::Iter::GetNext() in //device.

device/generic_sensor/platform_sensor.cc

Index: device/generic_sensor/platform_sensor.cc
diff --git a/device/generic_sensor/platform_sensor.cc b/device/generic_sensor/platform_sensor.cc
index a9b2604bb3c9b11b705ca0a38ad3a58b8279a99c..ced76bbffdebdc802e3e8de19681dc1375211d33 100644
--- a/device/generic_sensor/platform_sensor.cc
+++ b/device/generic_sensor/platform_sensor.cc
@@ -98,12 +98,9 @@ void PlatformSensor::UpdateSensorReading(const SensorReading& reading,
 }
 
 void PlatformSensor::NotifySensorReadingChanged() {
-  using ClientsList = decltype(clients_);
-  ClientsList::Iterator it(&clients_);
-  Client* client;
-  while ((client = it.GetNext()) != nullptr) {
-    if (!client->IsNotificationSuspended())
-      client->OnSensorReadingChanged();
+  for (auto& client : clients_) {
+    if (!client.IsNotificationSuspended())
+      client.OnSensorReadingChanged();
   }
 }