Apply individual policies for the various parts of device status reports.

chrome/browser/chromeos/cros_settings_provider.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/chromeos/cros_settings_provider.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/values.h"
@@ skipping 16 matching lines @@
   // It should not reach here from UI in the guest mode, but just in case.
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kGuestSession) &&
       !::StartsWithASCII(path, "cros.session.", true)) {
     LOG(ERROR) << "Ignoring the guest request to change: " << path;
     return;
   }
   DoSet(path, value);
 }
 
 void CrosSettingsProvider::NotifyObservers(const std::string& path) {
-  notify_cb_.Run(path);
+  if (!notify_cb_.is_null())
+    notify_cb_.Run(path);
+}
+
+void CrosSettingsProvider::SetNotifyObserversCallback(
+    const NotifyObserversCallback& notify_cb) {
+  notify_cb_ = notify_cb;
 }
 
 };  // namespace chromeos