If Safari had been deleted, then installing it from the 10.8.2 combo update with Pacifist will not work. The 10.8.2 combo update only contains a partial copy of Safari 6.0.1. Most of the files that comprise the Safari application were not modified between 6.0 and 6.0.1, so they are not included in the 10.8.2 combo update. The end result is a non-functional application with the wrong icon that is only about 10% of the correct size (I tried it).
Using Pacifist to install Safari from the Mountain Lion installer will work, but if your copy of the installer is for an older version (i.e. 10.8 or 10.8.1) you would also need to manually install Safari from the 10.8.2 combo update using Pacifist (on top of the older version, so it updates the appropriate files) or just run the 10.8.2 combo install normally.
If you don't want to use Pacifist, then it is not difficult to reinstall the entire operating system (which won't require wiping anything), then reinstall the 10.8.2 combo update if your OS installer is an older version. This method will just take longer, and may require re-downloading the roughly 4.3 GB Mountain Lion installer or the roughly 650 MB 10.8.2 combo update. You need the Mountain Lion installer for either method anyway.
Message was edited by: David Empson