Update display::Display::kInvalidDisplayID constant.

ui/display/display.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_DISPLAY_DISPLAY_H_
 #define UI_DISPLAY_DISPLAY_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
@@ skipping 48 matching lines @@
     ROTATION_SOURCE_UNKNOWN,
   };
 
   // Touch support for the display.
   enum TouchSupport {
     TOUCH_SUPPORT_UNKNOWN,
     TOUCH_SUPPORT_AVAILABLE,
     TOUCH_SUPPORT_UNAVAILABLE,
   };
 
-  // Use display::kInvalidDisplayId from display_constants.h in new code.
-  // TODO(kylechar): Delete after all references are gone.
-  enum : int64_t { kInvalidDisplayID = display::kInvalidDisplayId };
-
   // Creates a display with kInvalidDisplayId as default.
   Display();
   explicit Display(int64_t id);
   Display(int64_t id, const gfx::Rect& bounds);
   Display(const Display& other);
   ~Display();
 
   // Returns the forced device scale factor, which is given by
   // "--force-device-scale-factor".
   static float GetForcedDeviceScaleFactor();
@@ skipping 126 matching lines @@
 
 #if !defined(OS_IOS)
   friend struct mojo::StructTraits<display::mojom::DisplayDataView,
                                    display::Display>;
 #endif
 };
 
 }  // namespace display
 
 #endif  // UI_DISPLAY_DISPLAY_H_