* Remove unnecessary `getEnvironmentType` parameter
The default value of the first parameter is `window.location.href`, so
there is no need to pass it in explicitly.
* Remove junk parameter from `getEnvironmentType` invocation
`getEnvironmentType` doesn't need to be passed any parameter, as the
default value is `window.location.href` which is generally what is
wanted. In this case, the variable `location.href` was always
`undefined` anyway. This particular `location` variable is from React
Router, and does not have an `href` property.
* Fix comment for `getEnvironmentType`
One of the possible return values was referred to by the wrong name.
The only web API that our usage of DetectRTC relied upon was
'enumerateDevices', which is supported and stable among all of our
supported browsers.
Note that the error handling here is a little... non-standard, and the
logic around how Firefox and Brave are handled should be justified, but
I've left the logic as-is for now to keep this PR small.
