Zoom happens twice on Android browser

On the Android browser when you click on the zoom in or zoom out button, it is zoomed in/out twice. It was reproduced with Android 4.1 on a real device and 2.3.3 via Cordova in the emulator.

It looks like the events are fired twice. [Issue #71](https://github.com/ftlabs/fastclick/issues/71) from FastClick might give hints.