Fix autoupdate_EndToEndTest on veyron_rialto

chrome/browser/chromeos/settings/cros_settings.cc

 // 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.
 
 #include "chrome/browser/chromeos/settings/cros_settings.h"
 
 #include <stddef.h>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 310 matching lines @@
     settings_observers_[path] =
         base::MakeUnique<base::CallbackList<void(void)>>();
     registry = settings_observers_[path].get();
   } else {
     registry = observer_iterator->second.get();
   }
 
   return registry->Add(callback);
 }
 
+void CrosSettings::ClearSettingsObservers(const std::string& path) {
+  settings_observers_[path]->ClearAll();
+}
+
 CrosSettingsProvider* CrosSettings::GetProvider(
     const std::string& path) const {
   for (size_t i = 0; i < providers_.size(); ++i) {
     if (providers_[i]->HandlesSetting(path))
       return providers_[i].get();
   }
   return nullptr;
 }
 
 void CrosSettings::FireObservers(const std::string& path) {
   DCHECK(CalledOnValidThread());
   auto observer_iterator = settings_observers_.find(path);
   if (observer_iterator == settings_observers_.end())
     return;
 
   observer_iterator->second->Notify();
 }
 
 ScopedTestCrosSettings::ScopedTestCrosSettings() {
   CrosSettings::Initialize();
 }
 
 ScopedTestCrosSettings::~ScopedTestCrosSettings() {
   CrosSettings::Shutdown();
 }
 
 }  // namespace chromeos