linux_aura: Fix cursor memeory leak, which was redding the lsan bot.

ui/views/widget/desktop_aura/desktop_native_widget_aura.h

 // Copyright (c) 2012 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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/activation_delegate.h"
@@ skipping 277 matching lines @@
 
   scoped_ptr<views::corewm::VisibilityController> visibility_controller_;
 
   scoped_ptr<views::corewm::WindowModalityController>
       window_modality_controller_;
 
   // See comments in OnLostActive().
   bool restore_focus_on_activate_;
 
   gfx::NativeCursor cursor_;
+  // We must manually reference count the number of users of |cursor_manager_|
+  // because the cursors created by |cursor_manager_| are shared among the
+  // DNWAs. We can't just stuff this in a LazyInstance because we need to
+  // destroy this as the last DNWA happens; we can't put it off until
+  // (potentially) after we tear down the X11 connection because that's a
+  // crash.
+  static int cursor_reference_count_;
   static views::corewm::CursorManager* cursor_manager_;
   static views::DesktopNativeCursorManager* native_cursor_manager_;
 
   scoped_ptr<corewm::ShadowController> shadow_controller_;
 
   // Reorders child windows of |window_| associated with a view based on the
   // order of the associated views in the widget's view hierarchy.
   scoped_ptr<WindowReorderer> window_reorderer_;
 
   // See class documentation for Widget in widget.h for a note about type.
   Widget::InitParams::Type widget_type_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopNativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_