SetHostConfiguration() and ConfigureHost() are moved from ScreenObserver.

chrome/browser/chromeos/login/screens/controller_pairing_screen.cc

Index: chrome/browser/chromeos/login/screens/controller_pairing_screen.cc
diff --git a/chrome/browser/chromeos/login/screens/controller_pairing_screen.cc b/chrome/browser/chromeos/login/screens/controller_pairing_screen.cc
index 7b7308e086159a5c1e76e25c74a71838792f5e10..735164bc9758cabc57de9326c6da45f0e2f2fb63 100644
--- a/chrome/browser/chromeos/login/screens/controller_pairing_screen.cc
+++ b/chrome/browser/chromeos/login/screens/controller_pairing_screen.cc
@@ -21,6 +21,7 @@ ControllerPairingScreen::ControllerPairingScreen(
     : BaseScreen(observer),
       actor_(actor),
       shark_controller_(shark_controller),
+      delegate_(nullptr),
       current_stage_(ControllerPairingController::STAGE_NONE),
       device_preselected_(false) {
   actor_->SetDelegate(this);
@@ -33,6 +34,10 @@ ControllerPairingScreen::~ControllerPairingScreen() {
   shark_controller_->RemoveObserver(this);
 }
 
+void ControllerPairingScreen::SetDelegate(Delegate* delegate) {
+  delegate_ = delegate;
+}
+
 void ControllerPairingScreen::CommitContextChanges() {
   if (!context_.HasChanges())
     return;
@@ -99,7 +104,8 @@ void ControllerPairingScreen::PairingStageChanged(Stage new_stage) {
       break;
     }
     case ControllerPairingController::STAGE_PAIRING_DONE: {
-      get_screen_observer()->SetHostConfiguration();
+      if (delegate_)
+        delegate_->SetHostConfiguration();
       break;
     }
     case ControllerPairingController::STAGE_HOST_UPDATE_IN_PROGRESS: {