You can uninstall or removes an installed chromium-testsuite-dbg package itself from Debian 7 (Wheezy) through the terminal,
$ sudo apt-get remove chromium-testsuite-dbg
If you would like to remove chromium-testsuite-dbg and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove chromium-testsuite-dbg
If you use with purge options to chromium-testsuite-dbg package all the configuration and dependent packages will be removed.
$ sudo apt-get purge chromium-testsuite-dbg
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove chromium-testsuite-dbg