The old cc.Browser and sys have been replaced with cc.sys.
Changes are :
//v3.x in the left while v2.x in the right
//constants
cc.sys.LANGUAGE_ENGLISH <-- cc.LANGUAGE_ENGLISH
cc.sys.LANGUAGE_CHINESE <-- cc.LANGUAGE_CHINESE
cc.sys.LANGUAGE_FRENCH <-- cc.LANGUAGE_FRENCH
cc.sys.LANGUAGE_ITALIAN <-- cc.LANGUAGE_ITALIAN
cc.sys.LANGUAGE_GERMAN <-- cc.LANGUAGE_GERMAN
cc.sys.LANGUAGE_SPANISH <-- cc.LANGUAGE_SPANISH
cc.sys.LANGUAGE_RUSSIAN <-- cc.LANGUAGE_RUSSIAN
cc.sys.LANGUAGE_KOREAN <-- cc.LANGUAGE_KOREAN
cc.sys.LANGUAGE_JAPANESE <-- cc.LANGUAGE_JAPANESE
cc.sys.LANGUAGE_HUNGARIAN <-- cc.LANGUAGE_HUNGARIAN
cc.sys.LANGUAGE_PORTUGUESE <-- cc.LANGUAGE_PORTUGUESE
cc.sys.LANGUAGE_ARABIC <-- cc.LANGUAGE_ARABIC
cc.sys.LANGUAGE_NORWEGIAN <-- cc.LANGUAGE_NORWEGIAN
cc.sys.LANGUAGE_POLISH <-- cc.LANGUAGE_POLISH
cc.sys.MULTIPLE_AUDIO_WHITE_LIST <-- cc.Browser.multipleAudioWhiteList
cc.sys.BROWSER_TYPE_*** <-- new
cc.sys.language <-- cc.Application.getInstance().getCurrentLanguage()
cc.sys.isNative <-- New. true in jsb, false in browsers
cc.sys.isMobile <-- cc.Browser.isMobile
cc.sys.browserType <-- cc.Browser.browserType
cc.sys._supportWebAudio <-- cc.Browser.supportWebAudio
cc.sys._supportRender <-- cc.RenderDoesnotSupport
cc.sys.localStorage <-- sys.localStorage
cc.sys.capabilities <-- sys.capabilities
cc.sys.os <-- sys.os
cc.sys.garbageCollect <-- sys.garbageCollect
cc.sys.dumpRoot <-- sys.dumpRoot
cc.sys.restartVM <-- sys.restartVM
cc.sys.version <-- sys.version
cc.openURL <-- cc.Browser.openURL
cc.sys.OS_WINDOWS <-- cc.PLATFORM_WINDOWS
cc.sys.OS_IOS <-- cc.PLATFORM_IPHONE | sys.PLATFORM_IPAD
cc.sys.OS_OSX <-- cc.PLATFORM_MACOS
cc.sys.OS_UNIX <-- new
cc.sys.OS_LINUX <-- cc.PLATFORM_LINUX
cc.sys.OS_ANDROID <-- cc.PLATFORM_ANDROID
cc.sys.OS_UNKNOWN <-- cc.PLATFORM_BLACKBERRY | cc.PLATFORM_NACL | cc.PLATFORM_EMSCRIPTEN
cc.config