Google Chrome can be rather GPU & CPU intensive - you should expect some higher temps when you run it. But your temps seem a bit too high - and your fans are kicking in to compensate for those high temps. 185ºF does seem about 20-30º too high, though. I would install the 14-day trial version of iStat Menus 4 and keep an eye on those temps and fan speeds. If 185º seems to be the 'norm' you may want to consider taking in your machine for diagnostics.