Remove the need to have separate config for authentication.

remoting/host/installer/chromoting.wxs

 <?xml version="1.0"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
 
   <?define EventSourceName = "chromoting" ?>
   <?define ServiceName = "chromoting" ?>
 
   <!-- TODO(alexeypa): There strings should be localized,
        see http://crbug.com/121785 -->
   <?if $(var.Branding) ~= Chrome ?>
     <?define ChromotingHost = "Chrome Remote Desktop Host" ?>
@@ skipping 115 matching lines @@
               KeyPath="yes"
               Name="remoting_service.exe"
               Vital="yes"/>
 
         <ServiceInstall Id="install_service"
                         Type="ownProcess"
                         Vital="yes"
                         Name="$(var.ServiceName)"
                         DisplayName="[chromoting_service_display_name]"
                         Description="[chromoting_service_description]"
-                        Arguments="--auth-config=&quot;[config_files]host.json&quot; --host-config=&quot;[config_files]host.json&quot;"
+                        Arguments="--host-config=&quot;[config_files]host.json&quot;"
                         Start="demand"
                         Account="LocalSystem"
                         ErrorControl="ignore"
                         Interactive="no" />
 
         <ServiceControl Id="start_service"
                         Stop="both"
                         Remove="uninstall"
                         Name="$(var.ServiceName)"
                         Wait="yes" />
@@ skipping 263 matching lines @@
       </Custom>
       <Custom Action="set_service_display_name" Before="InstallInitialize">
         <![CDATA[VersionNT >= 600]]>
       </Custom>
       <Custom Action="set_service_description" Before="InstallInitialize">
         <![CDATA[VersionNT >= 600]]>
       </Custom>
     </InstallExecuteSequence>
   </Product>
 </Wix>