This makes me think that Google had ulterior motives when bundling flash with Chrome. Having the latest, most-secure version of flash is a win for Google, its users, and the web in general, but having flash installed allows for usage of flash cookies which can read your info across browser sessions -- info that they'd probably want.
To Chrome's credit, I believe it is the only browser that allows users to delete flash cookies.
Knowing that a large percent of the user base won't use it/know about it, maybe they include the ability to delete flash cookies so that later they can say, "you can opt out at any time!"
I've said this before, but for others who missed it, here's one of my crontab entries:
# Remove Flash cookies and everything to do with Flash,
# including left-over Flash files in /tmp
15 13 * * Wed /usr/bin/rm -rf /home/nick/.macromedia/Flash_Player/*
16 13 * * Wed /usr/bin/rm -rf /tmp/Flash*
You can delete Flash cookies and in fact all data that a site could use to track you in Safari, including plugin-related data, cache, etc.
Just go to the Privacy pref pane and click on Details under Cookies and other Web Site Data. For example, for kongregate.com, I see that I have Cache, Cookies, Plug-ins and Local Storage holding potential tracking data, and I can delete it all with one click.
To Chrome's credit, I believe it is the only browser that allows users to delete flash cookies.
* removes tin foil hat