Why Chrome driver is used instead of Android Driver


I am trying to use default Android browser on Android emulator (using platform version 5.0.1 and API 21) … for this I am using following capabilities …

capabilities.setCapability(“platformName”, “Android”);
capabilities.setCapability(“platformVersion”, “5.0.1”);
capabilities.setCapability(“deviceName”, “Nexus7”);
capabilities.setCapability(“browserName”, “Browser”);

Everything works fine, but in Appium console why Chrome driver 2.15 is used from it default location ?
I am using Appium : 1.4