Update OS version checks.

remoting/host/installer/win/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 $(var.Branding) ~= Chrome ?>
     <?define ChromotingHost = "Chrome Remote Desktop Host" ?>
@@ skipping 76 matching lines @@
              Compressed="yes"
              Description="$(var.ChromotingHost) Package"
              InstallerVersion="200"
              Manufacturer="$(var.Manufacturer)"
              InstallScope="perMachine"/>
 
     <PropertyRef Id="WIX_ACCOUNT_LOCALSYSTEM" />
     <PropertyRef Id="WIX_ACCOUNT_ADMINISTRATORS" />
 
     <Condition
-      Message="$(var.ChromotingHost) is only supported on Windows XP, Windows Server 2003, or higher.">
-      <![CDATA[Installed OR (VersionNT >= 501)]]>
+      Message="$(var.ChromotingHost) is only supported on Windows 7 and above.">

[joedow, 2016/04/26 22:06:18]

The previous string also mentioned the minimum server version (WS2008 R2 now),
not sure if we want to keep this string simpler or also specify that as well.

[Jamie, 2016/04/26 22:36:37]

I think I'd rather keep it simple and consistent with the web-app (which
displays the string for every download, so simplicity is more important).

+      <![CDATA[Installed OR (VersionNT >= 601)]]>
     </Condition>
 
     <!-- The upgrade rules below could be expressed with MajorUpgrade element.
          Unfortunately, there is a bug in WiX decompiler (Dark) corrupting
          InstallExecuteSequence table. The installation compiled from
          the disassembled .msi schedules RemoveExistingProducts after
          InstallFinalize while the original installation schedules it after
          InstallInitialize. Fortunately, the verbose version of the upgrade
          rules below decompiles correctly, so we use it instead.
          See http://crbug.com/145265 for more details.
@@ skipping 500 matching lines @@
       ]]>
     </CustomAction>
 
     <CustomAction Id="set_service_display_name"
                   Property="chromoting_service_display_name"
                   Value="@[binaries]$(var.CoreBinary),-101" />
     <CustomAction Id="set_service_description"
                   Property="chromoting_service_description"
                   Value="@[binaries]$(var.CoreBinary),-102" />
 
-    <!-- XP does not support MUI strings in the service name and description, so
-         we fall back to plain strings on XP. -->
-    <CustomAction Id="set_service_display_name_xp"
-                  Property="chromoting_service_display_name"
-                  Value="$(var.ChromotingServiceName)" />
-    <CustomAction Id="set_service_description_xp"
-                  Property="chromoting_service_description"
-                  Value="$(var.ChromotingServiceDescription)" />
-
     <UIRef Id="WixUI_ErrorProgressText" />
 
     <Feature Id="chromoting_host" Level="1" Title="$(var.ChromotingHost)">
       <ComponentRef Id="credits"/>
       <ComponentRef Id="delete_debug_log"/>
       <ComponentRef Id="delete_usagestats"/>
       <?if $(var.OfficialBuild) != 0 ?>
         <ComponentRef Id="omaha_registration"/>
       <?endif?>
       <ComponentRef Id="icudtl"/>
@@ skipping 19 matching lines @@
     <Icon Id="chromoting.ico" SourceFile="chromoting.ico"/>
     <Property Id="ARPPRODUCTICON" Value="chromoting.ico" />
 
     <InstallExecuteSequence>
       <Custom Action="query_auto_start_service" Before="InstallInitialize"/>
       <Custom Action="start_chromoting_service" After="StartServices">
         <![CDATA[NOT REMOVE AND (auto_start_service = "#2")]]>
       </Custom>
 
       <!-- Set the service name and description -->
-      <Custom Action="set_service_display_name_xp" Before="InstallInitialize">
-        <![CDATA[VersionNT < 600]]>
-      </Custom>
-      <Custom Action="set_service_description_xp" Before="InstallInitialize">
-        <![CDATA[VersionNT < 600]]>
-      </Custom>
-      <Custom Action="set_service_display_name" Before="InstallInitialize">
-        <![CDATA[VersionNT >= 600]]>
-      </Custom>
-      <Custom Action="set_service_description" Before="InstallInitialize">
-        <![CDATA[VersionNT >= 600]]>
-      </Custom>
+      <Custom Action="set_service_display_name" Before="InstallInitialize"/>
+      <Custom Action="set_service_description" Before="InstallInitialize"/>
 
       <!-- Schedule RemoveExistingProducts before installing any files.
            See http://msdn.microsoft.com/en-us/library/aa371197.aspx. -->
       <RemoveExistingProducts After="InstallInitialize" />
     </InstallExecuteSequence>
   </Product>
 </Wix>