Fix compile error on x86-generic (32-bit) PFQ bots.

chrome/browser/chromeos/audio/audio_devices_pref_handler_impl.cc

 // Copyright (c) 2013 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/audio/audio_devices_pref_handler_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/prefs/scoped_user_pref_update.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/pref_names.h"
 #include "chromeos/audio/audio_device.h"
 #include "chromeos/audio/cras_audio_handler.h"
 
 namespace {
 
 std::string GetDeviceIdString(const chromeos::AudioDevice& device) {
   return device.display_name + " : " +
-         base::Uint64ToString((device.id & ((1ULL << 32) - 1)));
+         base::Uint64ToString(device.id & static_cast<uint64>(0xffffffff));
 }
 
 }
 
 namespace chromeos {
 
 double AudioDevicesPrefHandlerImpl::GetVolumeGainValue(
     const AudioDevice& device) {
   UpdateDevicesVolumePref();
 
@@ skipping 144 matching lines @@
   // handler code.
 }
 
 // static
 AudioDevicesPrefHandler* AudioDevicesPrefHandler::Create(
     PrefService* local_state) {
   return new AudioDevicesPrefHandlerImpl(local_state);
 }
 
 }  // namespace chromeos