Chrome is getting the job done for Google
Google's web browser Chrome has been growing in the last year and is now used by 5-7 % of Internet users (in the ballpark were I thought Chrome would be by now). Chrome hasn't gotten as many headlines as Google's mobile operating system Android, but Chrome is likely more important to Google's revenue and profit in the next 18 months.
By controlling the browser, Google makes sure it is the default search engine for users. By having its own web browser, Google doesn't have to pay Mozilla (Firefox), Apple (Safari) or Opera to be the default search engine and makes it impossible for Microsoft to buy a part of the market.