Convert a couple loops to range based iterators.

components/pairing/bluetooth_controller_pairing_controller.cc

Index: components/pairing/bluetooth_controller_pairing_controller.cc
diff --git a/components/pairing/bluetooth_controller_pairing_controller.cc b/components/pairing/bluetooth_controller_pairing_controller.cc
index 4c4d8557ca1a7e114c08e0d6eb0c466da5b2916d..bf5e7fdd611d96e2a8cdad5414252b12f93253be 100644
--- a/components/pairing/bluetooth_controller_pairing_controller.cc
+++ b/components/pairing/bluetooth_controller_pairing_controller.cc
@@ -137,11 +137,8 @@ void BluetoothControllerPairingController::OnStartDiscoverySession(
   discovery_session_ = discovery_session.Pass();
   ChangeStage(STAGE_DEVICES_DISCOVERY);
 
-  device::BluetoothAdapter::DeviceList device_list = adapter_->GetDevices();
-  for (device::BluetoothAdapter::DeviceList::iterator ix = device_list.begin();
-       ix != device_list.end(); ++ix) {
-    DeviceFound(*ix);
-  }
+  for (const auto& device : adapter_->GetDevices())
+    DeviceFound(device);
 }
 
 void BluetoothControllerPairingController::OnConnect() {