Revert of Merge Prevent DisplayPreferences from saving incorrect rotations.

ui/gfx/display.h

Index: ui/gfx/display.h
diff --git a/ui/gfx/display.h b/ui/gfx/display.h
index f6c23c1fbbac81ec55e16559f30481b0ec93cce1..fe2a40cf632b6fa81c5fa7119b2f87b1574cef0e 100644
--- a/ui/gfx/display.h
+++ b/ui/gfx/display.h
@@ -28,18 +28,6 @@
     ROTATE_90,
     ROTATE_180,
     ROTATE_270,
-  };
-
-  // The display rotation can have multiple causes for change. A user can set a
-  // preference. On devices with accelerometers, they can change the rotation.
-  // RotationSource allows for the tracking of a Rotation per source of the
-  // change. ROTATION_SOURCE_ACTIVE is the current rotation of the display.
-  // Rotation changes not due to an accelerometer, nor the user, are to use this
-  // source directly.
-  enum RotationSource {
-    ROTATION_SOURCE_ACCELEROMETER = 0,
-    ROTATION_SOURCE_ACTIVE,
-    ROTATION_SOURCE_USER,
   };
 
   // Touch support for the display.