To star the issue click on the star next to the word Issue...
http://code.google.com/p/chromium/issues/detail?id=150

...the star should turn yellow.
If you get a message saying something like the page is read only for maintenance then the star wont be visible, please try again later (I just got that message)

If you believe in this issue but dont want to install the extension, then please install the extension and then disable it on chromes Extensions page. This way the install count will still go up but it wont get in the way of allready assigned shortcuts or a webpages.

Good luck on this, I want / to search and focus on the link