[ubuntu] How to change google-chrome icon?

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http://ubuntuforums.org – Hey I wanted to use chromium version 24 and by chance I have found this ppa https://launchpad.net/~a-v-shkop/+archive/chromium-dev I have installed it and was trying to change the icon of google-chrome. I found that it is installed in /opt/google/chrome directory and there are some png files that vary in size, replacing that with new png icon I wanted to use didn't work. It had no icon instead of having the new icon. There isn't a binary file that has the chrome icon either, google-chrome is a bash script and the binary it executes doesn't have an icon that I can change by doing propert (Hardware)