x11: Use scoped_ptr<> for X11 objects where it makes sense.

ui/gfx/x/x11_types.h

Index: ui/gfx/x/x11_types.h
diff --git a/ui/gfx/x/x11_types.h b/ui/gfx/x/x11_types.h
index 945776d3bfa7ce6359d1c94f8ab572a3ebac6bf9..82ce8389bd99bde7c97c22a0a85be33d26c5b9b3 100644
--- a/ui/gfx/x/x11_types.h
+++ b/ui/gfx/x/x11_types.h
@@ -6,6 +6,7 @@
 #define UI_GFX_X_X11_UTIL_H_
 
 #include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/gfx_export.h"
 
 typedef unsigned long XAtom;
@@ -14,8 +15,20 @@ typedef struct _XImage XImage;
 typedef struct _XGC *GC;
 typedef struct _XDisplay XDisplay;
 
+extern "C" {
+int XFree(void*);
+}
+
 namespace gfx {
 
+template <class T, class R, R (*F)(T*)>
+struct XObjectDeleter {
+  inline void operator()(void* ptr) const { F(static_cast<T*>(ptr)); }
+};
+
+template <class T, class D = XObjectDeleter<void, int, XFree>>
+using XScopedPtr = scoped_ptr<T, D>;
+
 // TODO(oshima|evan): This assume there is one display and doesn't work
 // undef multiple displays/monitor environment. Remove this and change the
 // chrome codebase to get the display from window.