Move chromeos specific utility functions for display to chromeos/display

ui/gfx/display.cc

Index: ui/gfx/display.cc
diff --git a/ui/gfx/display.cc b/ui/gfx/display.cc
index 79e32d2ed38ba18983c9c3656fb5dcebe64e79b1..fe89b5e9b9ce793b46456a33a58b9f45f872f669 100644
--- a/ui/gfx/display.cc
+++ b/ui/gfx/display.cc
@@ -52,16 +52,6 @@ bool Display::HasForceDeviceScaleFactor() {
   return HasForceDeviceScaleFactorImpl();
 }
 
-// static
-int64 Display::GetID(uint16 manufacturer_id,
-                     uint16 product_code,
-                     uint8 output_index) {
-  int64 new_id = ((static_cast<int64>(manufacturer_id) << 24) |
-                  (static_cast<int64>(product_code) << 8) | output_index);
-  DCHECK_NE(kInvalidDisplayID, new_id);
-  return new_id;
-}
-
 Display::Display()
     : id_(kInvalidDisplayID),
       device_scale_factor_(GetForcedDeviceScaleFactor()),