Chromoting needs null GPO provider in PolicyLoaderWin.

components/policy/core/common/policy_loader_win.h

Index: components/policy/core/common/policy_loader_win.h
diff --git a/components/policy/core/common/policy_loader_win.h b/components/policy/core/common/policy_loader_win.h
index 9d99c1bba9f15652b4c9c62c7088fa63a49ac8c4..bbcf5b0f1fc8043be8178e8013e16a18d91b663d 100644
--- a/components/policy/core/common/policy_loader_win.h
+++ b/components/policy/core/common/policy_loader_win.h
@@ -51,6 +51,9 @@ class POLICY_EXPORT PolicyLoaderWin
   // 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);