Device owns the RecoveryUI instance.

Test: mmma -j bootable/recovery
Test: Build and boot into recovery, w/ and w/o enabling quiescent mode
      respectively.
Change-Id: I5d9bb945a6c3c9a3b96199fa0c8071a2f91339a0
diff --git a/screen_ui.h b/screen_ui.h
index 293696d..2d6b621 100644
--- a/screen_ui.h
+++ b/screen_ui.h
@@ -114,7 +114,7 @@
   explicit ScreenRecoveryUI(bool scrollable_menu);
 
   bool Init(const std::string& locale) override;
-  std::string GetLocale() override;
+  std::string GetLocale() const override;
 
   // overall recovery state ("background image")
   void SetBackground(Icon icon) override;