Remove ash localization from display_manager.cc

ash/display/display_manager.h

Index: ash/display/display_manager.h
diff --git a/ash/display/display_manager.h b/ash/display/display_manager.h
index 9b2c17de7ae99c387e0ad580c251f60d709ae422..a9b5ae3f57f272eaf82936203496f80b08260582 100644
--- a/ash/display/display_manager.h
+++ b/ash/display/display_manager.h
@@ -77,6 +77,9 @@ class ASH_EXPORT DisplayManager
     // Get the ui::DisplayConfigurator.
     virtual ui::DisplayConfigurator* display_configurator() = 0;
 #endif
+
+    virtual std::string GetInternalDisplayNameString() = 0;
+    virtual std::string GetUnknownDisplayNameString() = 0;
   };
 
   // How the second display will be used.