I use the daily ppa build of Chromium. The daily build uses a PNG I believe instead of an SVG, so it looks rather horrid on my dock.

And zoomed in:

(Not too sure why the icon is getting clipped in this screenshot, I did a select area method which perhaps has made it funky. Anyway, you get the idea!)
So after every update, I have to manually go into /usr/share/applications and manually select an SVG Chromium icon for the Chromium launcher to use. Since Chromium uses the daily build, this is rather tedious to do following every update.
Is there a means / scripting method that can be put into place that will automatically change Chromium's icon following an update of Chromium?