When pepper flash is uninstalled (disabling alone doesn't seem to be enough) and a page with flash content is opened, download prompts are triggered. This doesn't happen in Chromium.

Example: http://wiki.shoryuken.com/Skullgirls/Mechanics/Advanced_Mechanics

Minimal example HTML:

<object width="700" height="430"><param name="movie" value="http://www.youtube.com/v/F86Q4juJgmc"></param><embed src="http://www.youtube.com/v/F86Q4juJgmc" type="application/x-shockwave-flash" wmode="transparent" width="700" height="430"></embed></object>

I can't reproduce with 5.9.3, but with 5.10 and newer.