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

ui/views/widget/desktop_aura/desktop_native_widget_aura.h

Index: ui/views/widget/desktop_aura/desktop_native_widget_aura.h
diff --git a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
index 74ef63428d87c2d263f978c1408c178fdfe524f3..8f74d3780bac9047408a4d9382d4b9f691a30d01 100644
--- a/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
+++ b/ui/views/widget/desktop_aura/desktop_native_widget_aura.h
@@ -5,6 +5,7 @@
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_NATIVE_WIDGET_AURA_H_
 
+#include "base/lazy_instance.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/activation_delegate.h"
@@ -295,7 +296,8 @@ class VIEWS_EXPORT DesktopNativeWidgetAura
   bool restore_focus_on_activate_;
 
   gfx::NativeCursor cursor_;
-  static views::corewm::CursorManager* cursor_manager_;
+  static base::LazyInstance<scoped_ptr<views::corewm::CursorManager> >
+      cursor_manager_;
   static views::DesktopNativeCursorManager* native_cursor_manager_;
 
   scoped_ptr<corewm::ShadowController> shadow_controller_;