Well sometimes you want to hide everything you surf on Google Chrome, because of some special or some stupid reasons. :P
P.S: Guys can very well understand 
By the way Google Chrome offer you a spy mode called Incognito [ CTRL + SHIFT + N] which let you surf web anonymous, the main feature of using Incognito mode is that it wouldn’t save your browsing data like Toolbar History or Main History so outsiders will not even know what you gone through. Read more about it in my previous post “Chrome Benefits for Guys – Troll will explain you”
The main drawback of using Incognito mode is that you can’t see the browsing history even when you are on browser. Because it never-ever save any kind of data for future use.
So if you want to use your data in future and also don’t want anybody access your browsing data in unauthorized way.
Don’t worry here is a solution.
Browser Lock
There is a Chrome Extension ” Browser Lock” by Dere? which don’t let others use your browser without your permission.
Download ‘Browser Lock’ Extension
How to use:
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Press your combination (default: Ctrl+Shift+L) to lock or unlock.
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You can change the password in the chrome setting. [chrome://extension]
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Restart and reopen your browser after you have change any settings.
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You CAN also change the default combination.
i dont want to lock my browser i just want to password the history so no one can delete anything but me using a password.
Thanks Dan for your comment, but locking the only history in Chrome is currently not possible due to Policy of Google Chrome.
What if I want to password protect the whole SETTINGS menu, not just the history, is it possible ?
No, I think the chrome will not allowed. btw you use the same Chrome Extension I have mentioned above to protect your whole browser.