Are you using a Nexus device? I don't think they replaced the browser on Nexus devices older than Nexus 7. Only new devices that have been launched after June

Are you using a Nexus device? I don't think they replaced the browser on Nexus devices older than Nexus 7. Only new devices that have been launched after June last year with Android 4.1 on board should have it by default, and as I said most manufacturers have probably left the other browser in there even on new devices. But the new Nexus/Motorola devices should have it.