Remove stl_util's STLDeleteContainerPairSecondPointers from ui/.

ui/display/chromeos/x11/native_display_delegate_x11.h

Index: ui/display/chromeos/x11/native_display_delegate_x11.h
diff --git a/ui/display/chromeos/x11/native_display_delegate_x11.h b/ui/display/chromeos/x11/native_display_delegate_x11.h
index 403a585cd87bca24aecc4cf5e5e7c61841b79776..ccff0a51ecd903754ac6c6a5e4d1dc566c5dfcb2 100644
--- a/ui/display/chromeos/x11/native_display_delegate_x11.h
+++ b/ui/display/chromeos/x11/native_display_delegate_x11.h
@@ -152,7 +152,7 @@ class DISPLAY_EXPORT NativeDisplayDelegateX11 : public NativeDisplayDelegate {
       gfx::XObjectDeleter<XRRScreenResources, void, XRRFreeScreenResources>>
       screen_;
 
-  std::map<RRMode, DisplayModeX11*> modes_;
+  std::map<RRMode, std::unique_ptr<DisplayModeX11>> modes_;
 
   // Every time GetOutputs() is called we cache the updated list of outputs in
   // |cached_outputs_| so that we can check for duplicate events rather than