X11: Remove calls to XSelectInput

ui/base/x/x11_scoped_event_selector.h

 // Copyright 2016 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.
 
-#ifndef UI_BASE_X_X11_WINDOW_EVENT_MANAGER_H_
-#define UI_BASE_X_X11_WINDOW_EVENT_MANAGER_H_
+#ifndef UI_BASE_X_X11_SCOPED_EVENT_SELECTOR_H_
+#define UI_BASE_X_X11_SCOPED_EVENT_SELECTOR_H_
 
 #include <map>
-#include <vector>
 
-#include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/base/x/ui_base_x_export.h"
 #include "ui/gfx/x/x11_types.h"
 
-// A process wide singleton for selecting events on X windows which were not
-// created by Chrome.
-namespace base {
-template <typename T>
-struct DefaultSingletonTraits;
-}
-
 namespace ui {
 
 // Ensures events in |event_mask| are selected on |xid| for the duration of this
-// object's lifetime.
+// object's lifetime.  This class allows multiple clients within Chrome to
+// select events on the same X window.
 class UI_BASE_X_EXPORT XScopedEventSelector {
  public:
   XScopedEventSelector(XID xid, uint32_t event_mask);
   ~XScopedEventSelector();
 
  private:
-  XID xid_;
-  uint32_t event_mask_;
-
-  DISALLOW_COPY_AND_ASSIGN(XScopedEventSelector);
-};
-
-// Manages the events that Chrome has selected on X windows which were not
-// created by Chrome. This class allows multiple clients within Chrome to select
-// events on the same X window.
-class UI_BASE_X_EXPORT XWindowEventManager {
- public:
-  static XWindowEventManager* GetInstance();
-
- private:
-  friend struct base::DefaultSingletonTraits<XWindowEventManager>;
-  friend class XScopedEventSelector;
-
-  class MultiMask;
-
-  XWindowEventManager();
-  ~XWindowEventManager();
-
   // Guarantees that events in |event_mask| will be reported to Chrome.
   void SelectEvents(XID xid, uint32_t event_mask);
 
   // Deselects events on |event_mask|.  Chrome will stop receiving events for
   // any set bit in |event_mask| only if no other client has selected that bit.
   void DeselectEvents(XID xid, uint32_t event_mask);
 
   // Called whenever the mask corresponding to window |xid| might have changed.
   // Updates the event mask with respect to the server, if necessary.
   void AfterMaskChanged(XID xid, uint32_t old_mask);
 
-  std::map<XID, std::unique_ptr<MultiMask>> mask_map_;
+  class MultiMask;
 
-  DISALLOW_COPY_AND_ASSIGN(XWindowEventManager);
+  XID xid_;
+  uint32_t event_mask_;
+
+  static std::map<XID, std::unique_ptr<MultiMask>> mask_map_;
+
+  DISALLOW_COPY_AND_ASSIGN(XScopedEventSelector);
 };
 
 }  // namespace ui
 
-#endif  // UI_BASE_X_X11_FOREIGN_WINDOW_MANAGER_H_
+#endif  // UI_BASE_X_X11_SCOPED_EVENT_SELECTOR_H_