Remove usages of XInternAtom

ui/views/test/x11_property_change_waiter.h

Index: ui/views/test/x11_property_change_waiter.h
diff --git a/ui/views/test/x11_property_change_waiter.h b/ui/views/test/x11_property_change_waiter.h
index c70ab603166e6299c3cc551d119a9d45eb74c335..e0bbee54251d5b74d3b72e9796f953bd6dbbff45 100644
--- a/ui/views/test/x11_property_change_waiter.h
+++ b/ui/views/test/x11_property_change_waiter.h
@@ -17,7 +17,6 @@
 
 namespace ui {
 class ScopedEventDispatcher;
-class X11AtomCache;
 class XScopedEventSelector;
 }
 
@@ -58,8 +57,6 @@ class X11PropertyChangeWaiter : public ui::PlatformEventDispatcher {
 
   std::unique_ptr<ui::ScopedEventDispatcher> dispatcher_;
 
-  std::unique_ptr<ui::X11AtomCache> atom_cache_;
-
   DISALLOW_COPY_AND_ASSIGN(X11PropertyChangeWaiter);
 };