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

content/common/gpu/x_util.h

Index: content/common/gpu/x_util.h
diff --git a/content/common/gpu/x_util.h b/content/common/gpu/x_util.h
index 6fff98158a06f8118ff7f543efc7ca86ade21f86..99687566356f88386158569d2dd3ff1afd99dce6 100644
--- a/content/common/gpu/x_util.h
+++ b/content/common/gpu/x_util.h
@@ -33,16 +33,6 @@ typedef struct __GLXcontextRec *GLXContext;
 
 }  // extern "C"
 
-// Utils -----------------------------------------------------------------------
-
-// scoped_ptr functor for XFree(). Use as follows:
-//   scoped_ptr_mallox<XVisualInfo, ScopedPtrXFree> foo(...);
-// where "XVisualInfo" is any X type that is freed with XFree.
-class ScopedPtrXFree {
- public:
-  void operator()(void* x) const;
-};
-
 }  // namespace content
 
 #endif  // USE_X11