[cros] check for updates in WebUI OOBE can be cancelled in dev builds.

chrome/browser/chromeos/login/update_screen.cc

Index: chrome/browser/chromeos/login/update_screen.cc
diff --git a/chrome/browser/chromeos/login/update_screen.cc b/chrome/browser/chromeos/login/update_screen.cc
index f1dc23c3ea4ba72de467beb881409cc939aec13c..a1c7ae0bab87baf82e460a51d5b8e5e1be1bba53 100644
--- a/chrome/browser/chromeos/login/update_screen.cc
+++ b/chrome/browser/chromeos/login/update_screen.cc
@@ -77,6 +77,7 @@ UpdateScreen::UpdateScreen(ScreenObserver* screen_observer,
       is_shown_(false),
       ignore_idle_status_(true),
       actor_(actor) {
+  actor_->SetDelegate(this);
   GetInstanceSet().insert(this);
 }
 
@@ -190,6 +191,7 @@ void UpdateScreen::StartUpdate() {
 }
 
 void UpdateScreen::CancelUpdate() {
+  VLOG(1) << "Forced update cancel";
   ExitUpdate(REASON_UPDATE_CANCELED);
 }