Chromoting Host installation has to be per-machine, not per-user.

remoting/host/installer/chromoting.wxs

 <?xml version="1.0"?>
 <Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">
 
   <?define EventSourceName = "chromoting" ?>
   <?define ServiceName = "chromoting" ?>
 
   <?if $(var.Branding) ~= Chrome ?>
     <?define ChromotingHost = "Chrome Remote Desktop Host" ?>
     <?define FirewallName = "Chrome Remote Desktop Host" ?>
     <?define Manufacturer = "Google Inc." ?>
@@ skipping 34 matching lines @@
            Language="1033"
            Manufacturer="$(var.Manufacturer)"
            Name="$(var.ChromotingHost)"
            UpgradeCode="$(var.UpgradeCode)"
            Version="$(var.Version)">
 
     <Package Comments="$(var.ChromotingHost) Package"
              Compressed="yes"
              Description="$(var.ChromotingHost) Package"
              InstallerVersion="200"
-             Manufacturer="$(var.Manufacturer)"/>
+             Manufacturer="$(var.Manufacturer)"
+             InstallScope="perMachine"/>
 
     <Condition
       Message="$(var.ChromotingHost) is only supported on Windows Vista, Windows Server 2008, or higher.">
       <![CDATA[Installed OR (VersionNT >= 600)]]>
     </Condition>
 
     <MajorUpgrade
       AllowSameVersionUpgrades="yes"
       DowngradeErrorMessage="A later version of [ProductName] is already installed. Setup will now exit."
       Schedule="afterInstallInitialize" />
@@ skipping 274 matching lines @@
     <Property Id="ARPPRODUCTICON" Value="chromoting.ico" />
 
     <InstallExecuteSequence>
       <Custom Action="query_auto_start_service" Before="InstallInitialize"/>
       <Custom Action="set_auto_start_service" After="StartServices">
         <![CDATA[NOT REMOVE AND (auto_start_service = "#2")]]>
       </Custom>
     </InstallExecuteSequence>
   </Product>
 </Wix>