Split ui/display types into separate module and have Ozone depend on it

ui/display/chromeos/native_display_observer.h

Index: ui/display/chromeos/native_display_observer.h
diff --git a/ui/display/chromeos/native_display_observer.h b/ui/display/chromeos/native_display_observer.h
deleted file mode 100644
index 189aa99ccf572ade4a38c54007037f104eb8b832..0000000000000000000000000000000000000000
--- a/ui/display/chromeos/native_display_observer.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2014 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_CHROMEOS_NATIVE_DISPLAY_OBSERVER_H_
-#define UI_DISPLAY_CHROMEOS_NATIVE_DISPLAY_OBSERVER_H_
-
-namespace ui {
-
-// Observer class used by NativeDisplayDelegate to announce when the display
-// configuration changes.
-class NativeDisplayObserver {
- public:
-  virtual ~NativeDisplayObserver() {}
-
-  virtual void OnConfigurationChanged() = 0;
-};
-
-}  //  namespace ui
-
-#endif  // UI_DISPLAY_CHROMEOS_NATIVE_DISPLAY_OBSERVER_H_