ObserverList::HasObserver now takes a const pointer.

chrome/browser/chromeos/settings/device_settings_test_helper.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/device_settings_test_helper.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h"
@@ skipping 82 matching lines @@
 
 void DeviceSettingsTestHelper::Init(dbus::Bus* bus) {}
 
 void DeviceSettingsTestHelper::SetStubDelegate(
     SessionManagerClient::StubDelegate* delegate) {}
 
 void DeviceSettingsTestHelper::AddObserver(Observer* observer) {}
 
 void DeviceSettingsTestHelper::RemoveObserver(Observer* observer) {}
 
-bool DeviceSettingsTestHelper::HasObserver(Observer* observer) {
+bool DeviceSettingsTestHelper::HasObserver(const Observer* observer) const {
   return false;
 }
 
 void DeviceSettingsTestHelper::EmitLoginPromptVisible() {}
 
 void DeviceSettingsTestHelper::RestartJob(int pid,
                                           const std::string& command_line) {}
 
 void DeviceSettingsTestHelper::StartSession(const std::string& user_email) {}
 
@@ skipping 136 matching lines @@
                                                             profile_.get());
   }
   OwnerSettingsServiceChromeOS* service =
       OwnerSettingsServiceChromeOSFactory::GetForProfile(profile_.get());
   CHECK(service);
   if (tpm_is_ready)
     service->OnTPMTokenReady(true /* token is enabled */);
 }
 
 }  // namespace chromeos