browser or OS?

New Google operation system is chrome.As we know chrome is Google browser and of course isn't famous as IE and Firefox.Google chrome will be web based also and it means that it is developed from chrome browser.Some news say that Microsoft planed new browser called Gazelle and will have same futures as chrome and IE.It means that browser going to be OS .We know that our more works is based on web today but a web based OS can be more secure and safe as new operations system?Google say that chrome is faster than windows because that isn't necessary to setup programs ?At last we should see that web based OS can be success as nowadays OS or should be used with them?