The Internet icon is the default / stock browser included in android. If you have an HTC or samsung phone then it's still googles stock browser only slightly skinned. It is also slightly outdated as far as browser features and standards go since its included with the operating system itself and doesn't get updated unless the operating system itself is updated. It is loosely based off google Chrome but unlike the separate google Chrome app itself that you have installed doesn't receive updates hence why it's slightly outdated and I would recommend using the one labelled Google Chrome instead. Installing firefox is another option but its a bit of a memory hog and again since you already have chrome installed it would probably be the better choice out of all 3.