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

content/common/gpu/x_util.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 CONTENT_COMMON_GPU_X_UTIL_H_
 #define CONTENT_COMMON_GPU_X_UTIL_H_
 
 // Some X-Windows specific stuff. This can be included on any platform, and will
 // be a NOP on non-Linux ones.
 
@@ skipping 15 matching lines @@
 
 typedef unsigned long XID;
 
 extern "C" {
 
 typedef struct _XDisplay Display;
 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
 
 #endif  // CONTENT_COMMON_GPU_X_UTIL_H_