Cleanup: Remove unneeded scoped_ptr.h includes from net.

net/disk_cache/stats.h

Index: net/disk_cache/stats.h
===================================================================
--- net/disk_cache/stats.h	(revision 137567)
+++ net/disk_cache/stats.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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.
 
@@ -10,7 +10,6 @@
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
 #include "net/disk_cache/stats_histogram.h"
 
 namespace disk_cache {