Use client_domain instead of domain for url in CC.xml

lib/travis/api/app/responders/xml.rb

@@ -34,7 +34,7 @@ module Travis::Api::App::Responders
       def data
         {
           name:     resource.slug,
-          url:      File.join("https://", Travis.config.domain, resource.slug),
+          url:      File.join("https://", Travis.config.client_domain, resource.slug),
           activity: activity,
           label:    last_build.try(:number),
           status:   status,

spec/spec_helper.rb

@@ -14,7 +14,7 @@ require 'support/matchers'
 
 Travis.logger = Logger.new(StringIO.new)
 Travis::Api::App.setup
-Travis.config.domain = "www.example.com"
+Travis.config.client_domain = "www.example.com"
 
 module TestHelpers
   include Sinatra::TestHelpers