Effective March 1st, If you want to avoid Google from evidently linking all your hush-hush files, documents, numbers, facts and figures basically all the information it has gathered from your Gmail, YouTube, Google+ or any other Google related searches and accounts, you can NOW remove your Web History and STOP it from being recorded and passed on.
It is pretty easy to do that, i have attached a couple of links as follows :
Good Luck and Happy Browsing!!