Fix namespace for src/ui/display/.

ash/display/display_error_observer_chromeos.h

Index: ash/display/display_error_observer_chromeos.h
diff --git a/ash/display/display_error_observer_chromeos.h b/ash/display/display_error_observer_chromeos.h
index e421b6f7777edde5ceb32ad2a313e07e88a12434..295c54199ad2434730831d672b38ce47b6329477 100644
--- a/ash/display/display_error_observer_chromeos.h
+++ b/ash/display/display_error_observer_chromeos.h
@@ -16,15 +16,15 @@ namespace ash {
 // The class to observe the output failures and shows the error dialog when
 // necessary.
 class ASH_EXPORT DisplayErrorObserver
-    : public ui::DisplayConfigurator::Observer {
+    : public display::DisplayConfigurator::Observer {
  public:
   DisplayErrorObserver();
   ~DisplayErrorObserver() override;
 
-  // ui::DisplayConfigurator::Observer overrides:
+  // display::DisplayConfigurator::Observer overrides:
   void OnDisplayModeChangeFailed(
-      const ui::DisplayConfigurator::DisplayStateList& displays,
-      ui::MultipleDisplayState failed_new_state) override;
+      const display::DisplayConfigurator::DisplayStateList& displays,
+      display::MultipleDisplayState failed_new_state) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DisplayErrorObserver);