Request to change the device.platform to always report the browser platform as "browser".

The current Browser platform implementation relies on the value returned by the web browser's `navigator.platform`, which has many possible values, making platform-specific checks difficult. For example, a Browser platform build viewed on an Android device might report the `device.platform` as "Android", causing the Cordova app to execute code intended for the Android platform, instead of the desired code intended for the Browser platform.