Separate users on one browser can be handy for web developers and advanced users. Plus Google Chrome and Firefox share a history aware address bar or “Awesome Bar” that can create awkward situations if there is a lack of it. Creating separate users in most of the browsers can be tricky (especially in ff 2.x versions). I dont know why is that, there is no good reason for it but things are as they are. So if you want to create your user in Chrome you need to manually create a folder in Chrome’s application data folder, and that’s about it. Create shortcut of your own Chrome and leave no tracks on others. If you need more help check out this.
For Windows Vista - C:\Users\\AppData\Local\Google\Chrome
For Windows XP - C:\Documents and Settings\\Local