Add a source id to global NetLog entries.

net/url_request/url_request_throttler_manager.h

Index: net/url_request/url_request_throttler_manager.h
===================================================================
--- net/url_request/url_request_throttler_manager.h	(revision 126769)
+++ net/url_request/url_request_throttler_manager.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.
 
@@ -166,8 +166,8 @@
   // being disabled for localhost.
   bool logged_for_localhost_disabled_;
 
-  // NetLog to use, or NULL if none configured.
-  scoped_ptr<BoundNetLog> net_log_;
+  // NetLog to use, if configured.
+  BoundNetLog net_log_;
 
   // Valid once we've registered for network notifications.
   base::PlatformThreadId registered_from_thread_;