Android browser logo

Took a lot of work (tell you later), but we now have a hi-res asset for the Android browser!! :fireworks: 

From https://github.com/alrra/browser-logos/issues/45#issuecomment-42395468

> As long as the logo is for the browser provided in the official source code, I would gladly accept a pull request. Also, I would appreciate if the one making the pull request would provide the Android version.

This is the same one that's in the AOSP bundle: https://android.googlesource.com/platform/packages/apps/Browser/+/master/res/mipmap-xxhdpi/ic_launcher_browser.png