Chromoting needs null GPO provider in PolicyLoaderWin.

components/policy/core/common/policy_loader_win.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 COMPONENTS_POLICY_CORE_COMMON_POLICY_LOADER_WIN_H_
 #define COMPONENTS_POLICY_CORE_COMMON_POLICY_LOADER_WIN_H_
 
 #include <windows.h>
 #include <userenv.h>
 
@@ skipping 33 matching lines @@
 
 // Loads policies from the Windows registry, and watches for Group Policy
 // notifications to trigger reloads.
 class POLICY_EXPORT PolicyLoaderWin
     : public AsyncPolicyLoader,
       public base::win::ObjectWatcher::Delegate {
  public:
   // The PReg file name used by GPO.
   static const base::FilePath::CharType kPRegFileName[];
 
+  // Passing |gpo_provider| equal nullptr forces all reads to go through the
+  // registry.  This is undesirable for Chrome (see crbug.com/259236), but
+  // needed for some other use cases (i.e. Chromoting - see crbug.com/460734).
   PolicyLoaderWin(scoped_refptr<base::SequencedTaskRunner> task_runner,
                   const base::string16& chrome_policy_key,
                   AppliedGPOListProvider* gpo_provider);
   virtual ~PolicyLoaderWin();
 
   // Creates a policy loader that uses the Win API to access GPO.
   static scoped_ptr<PolicyLoaderWin> Create(
       scoped_refptr<base::SequencedTaskRunner> task_runner,
       const base::string16& chrome_policy_key);
 
@@ skipping 52 matching lines @@
   base::win::ObjectWatcher machine_policy_watcher_;
   bool user_policy_watcher_failed_;
   bool machine_policy_watcher_failed_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyLoaderWin);
 };
 
 }  // namespace policy
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_POLICY_LOADER_WIN_H_