UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.75 Safari/537.36

Steps to reproduce the problem:
I'm try to enterprise (Active Directory) install extensions from local web site. 
1. Use new GPO policy ExtensionSettings.
2. Here is policy:
{
   "gcbommkclmclpchllfjekcdonpmejbdp": {
      "install_sources": [ "http://srv01.chrome.local" ],
      "installation_mode": "force_installed",
      "update_url": "http://srv01.chrome.local/update.xml"
   }
}

3. Config and upload update.xml to http://srv01.chrome.local/

<?xml version='1.0' encoding='UTF-8'?>
<gupdate xmlns='http://www.google.com/update2/response' protocol='2.0'>
  <app appid='gcbommkclmclpchllfjekcdonpmejbdp'>
    <updatecheck codebase='http://srv01.chrome.local/he.crx' version='2017.10.30' />
</gupdate>
4. Upload extension gcbommkclmclpchllfjekcdonpmejbdp to http://srv01.chrome.local/ and save as he.crx

What is the expected behavior?
Extension gcbommkclmclpchllfjekcdonpmejbdp should slient instal for Windows 7 Workstation.

What went wrong?
Policy don't accept with status: Schema validation error at "(ROOT)": Unknown property: install_property

Did this work before? N/A 

Chrome version: 62.0.3202.75  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version:
 

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