Remove usages of XInternAtom

ui/base/x/selection_requestor.h

Index: ui/base/x/selection_requestor.h
diff --git a/ui/base/x/selection_requestor.h b/ui/base/x/selection_requestor.h
index e698010b9c7dc2cd6a21a672e0c307dda40003dd..65d944a121cbb46d7dbc7a5250663dc465739c25 100644
--- a/ui/base/x/selection_requestor.h
+++ b/ui/base/x/selection_requestor.h
@@ -16,7 +16,6 @@
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "ui/base/ui_base_export.h"
-#include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/gfx/x/x11_types.h"
 
 namespace ui {
@@ -150,8 +149,6 @@ class UI_BASE_EXPORT SelectionRequestor {
   // Used to abort requests if the selection owner takes too long to respond.
   base::RepeatingTimer abort_timer_;
 
-  X11AtomCache atom_cache_;
-
   DISALLOW_COPY_AND_ASSIGN(SelectionRequestor);
 };