Map iteration order is not defined either on the server side or in the
JSON spec. Make the order stable by simply sorting; the documentation
does not specify a particular order, so this is not a compatibility
problem.
Some users were seeing the first element in the dropdown vary when
reloading the app. Combined with the inability to save the preference
for custom schemes, this was frustrating both for the users and for
finding the core issue.
Change-Id: I13f56a32c2e362e08360e7b7a26f1bee3920b723
dbbdad2ef0