Remove usages of XInternAtom

ui/base/x/selection_owner.h

Index: ui/base/x/selection_owner.h
diff --git a/ui/base/x/selection_owner.h b/ui/base/x/selection_owner.h
index 52657e34c2c97ba633939d5173e66a8eb62042d9..d995dc4b196bc500d5ae606d5da560a3f0c6230e 100644
--- a/ui/base/x/selection_owner.h
+++ b/ui/base/x/selection_owner.h
@@ -16,7 +16,6 @@
 #include "base/timer/timer.h"
 #include "ui/base/ui_base_export.h"
 #include "ui/base/x/selection_utils.h"
-#include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/gfx/x/x11_types.h"
 
 namespace ui {
@@ -140,8 +139,6 @@ class UI_BASE_EXPORT SelectionOwner {
   // Used to abort stale incremental data transfers.
   base::RepeatingTimer incremental_transfer_abort_timer_;
 
-  X11AtomCache atom_cache_;
-
   DISALLOW_COPY_AND_ASSIGN(SelectionOwner);
 };