Move ui::GetAtom to gfx::GetAtom

ui/events/platform/x11/x11_event_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/platform/x11/x11_event_source.h"
 
 #include <X11/Xatom.h>
 #include <X11/XKBlib.h>
 #include <X11/Xlib.h>
 
@@ skipping 139 matching lines @@
   BlockOnWindowStructureEvent(window, MapNotify);
 }
 
 Time X11EventSource::GetCurrentServerTime() {
   DCHECK(display_);
 
   if (!dummy_initialized_) {
     // Create a new Window and Atom that will be used for the property change.
     dummy_window_ = XCreateSimpleWindow(display_, DefaultRootWindow(display_),
                                         0, 0, 1, 1, 0, 0, 0);
-    dummy_atom_ = X11AtomCache::GetInstance()->GetAtom("CHROMIUM_TIMESTAMP");
+    dummy_atom_ = gfx::GetAtom("CHROMIUM_TIMESTAMP");
     dummy_window_events_.reset(
         new XScopedEventSelector(dummy_window_, PropertyChangeMask));
     dummy_initialized_ = true;
   }
 
   base::TimeTicks start = base::TimeTicks::Now();
 
   // Make a no-op property change on |dummy_window_|.
   XChangeProperty(display_, dummy_window_, dummy_atom_, XA_STRING, 8,
                   PropModeAppend, nullptr, 0);
@@ skipping 124 matching lines @@
 
 void X11EventSource::OnDispatcherListChanged() {
   if (!hotplug_event_handler_) {
     hotplug_event_handler_.reset(new X11HotplugEventHandler());
     // Force the initial device query to have an update list of active devices.
     hotplug_event_handler_->OnHotplugEvent();
   }
 }
 
 }  // namespace ui