Remove DisplayState from the public interface for DisplayConfigurator

ui/display/chromeos/update_display_configuration_task.h

Index: ui/display/chromeos/update_display_configuration_task.h
diff --git a/ui/display/chromeos/update_display_configuration_task.h b/ui/display/chromeos/update_display_configuration_task.h
index 868f76fce50b0623ee3847b572ed2d0d06e6470e..c6447db57bf028b9314de2904427a728651074d4 100644
--- a/ui/display/chromeos/update_display_configuration_task.h
+++ b/ui/display/chromeos/update_display_configuration_task.h
@@ -20,7 +20,7 @@ class DISPLAY_EXPORT UpdateDisplayConfigurationTask {
  public:
   typedef base::Callback<void(
       bool /* success */,
-      const std::vector<DisplayConfigurator::DisplayState>& /* displays */,
+      const std::vector<DisplaySnapshot*>& /* displays */,
       const gfx::Size& /* framebuffer_size */,
       MultipleDisplayState /* new_display_state */,
       chromeos::DisplayPowerState /* new_power_state */)> ResponseCallback;
@@ -91,7 +91,7 @@ class DISPLAY_EXPORT UpdateDisplayConfigurationTask {
   bool force_dpms_;
 
   // List of updated displays.
-  std::vector<DisplayConfigurator::DisplayState> cached_displays_;
+  std::vector<DisplaySnapshot*> cached_displays_;
 
   gfx::Size framebuffer_size_;