Chrome is the stock browser on the S5 (at least for Verizon...I don't want to say it applies to all versions of the phone since I don't have them all, but I'd assume it applies to most if not all). Samsung doesn't have their own browser on there as they have on past devices.
Current: Galaxy S5, iPhone 5S, Note 10.1 (2014), iPad Mini (Retina)
Previous smartphones: One M8, Note 3, HTC One, Note 2, Galaxy S3, One X, RAZR MAXX, Galaxy Nexus, Rezound, Note, iPhone 4S, Bionic, Stratosphere, Charge, Vitality, Incredible 2, Thunderbolt, Palm Pixi+, Droid 3, Fascinate, Incredible, Droid Pro, Droid 2 Global, Droid X, Droid, Treo Pro, Touch Pro 2, Touch Pro, Q9m, XV6800, XV6900
Previous tablets: Note 8, Nexus 7, TF300, Evo View, Transformer Prime, TF101, Thrive, gTablet