Only now I realised they shut down Google Code Search. I tried searching something in an Open Source project recently. The search box on Google Code was still there, but it always returned 0 results... It's quite annoying when they just remove a feature and the only way you find out is by browsing Hacker News.
IT has been a while. But for what it's worth they recently added a search functionality in Google project hosting pages (For in project search). Such as: https://code.google.com/p/dart/codesearch