"Install Flash...", nope...enable Shockwave.
My experience is my own, but this may work for you.
Opening Pandora in Chrome a link to download Flash v10 or higher appears. Huh? It worked last week before I re-installed and slimmed down the add-ons/bloatware on my laptop. Turned off and allowed EVERYTHING including plug-ins like Pandora suggests as a test. Still nothing. Tried again but on a whim instead of allowing all plug-ins, I clicked "disable individual plug-ins" and found my post-install slimming last week wasn't being reset on the previous page so incrementally I re-allowed each one individually and found allowing the Shockwave add-in fixed it.