How to Block Website in Google Chrome

1. Launch Google Chrome.
2. Click on the "Wrench" in the upper-right corner of the toolbar, then choose "Options".
   
   

   Go to Options
3. Select "Under the Hood" tab and find "Network" panel. Then click "Change proxy settings".
   
   

   Under the hood tab
4. Switch to the "Privacy" tab and go to "Sites".
   
   

   Go to Privacy
5. In the window, type the web address you wanna block in the textbox, then click "Block".
   
   

   Block websites
6. Click "OK". Now you successfully block the website in Google Chrome.

Install a extension named BlockIt to Block web sites you want locally.
Block the web sites you want,Web content with out using proxy servers , Just add you web sites you want to the list and block them and unblock as you want.
New version supports password protected options and to add or remove web-links and Supports customizable blocked messages .