UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce the problem:
1. Install Chrome for Business MSI - version 57 or earlier
2. Set DefaultBrowserSettingEnabled = 1 via GPO / Registry on Domain Member
3. Let Chrome update to v58 via Google Updater
4. Log in as standard user
5. Run Chrome, UAC prompt for c:\program files (x86)\chrome\application\58.0.3029.81\setup.exe --system-level --register-chrome-browser="c:\program files (x86)\chrome\application\chrome.exe" appears
5. If you run chrome.exe --make-default-browser the same UAC prompt appears

If you run instead as an administrator and accept the UAC prompt, nothing happens and you are prompted to run it again next time you close and re-open Chrome.

We have not tested a fresh install of v58 yet, all our existing machines were on older versions and have upgraded recently.

If we set DefaultBrowserSettingEnabled = 0 the UAC prompt does not occur, even if Chrome is not currently the default browser.

What is the expected behavior?
Version 57 and below would make Chrome the default browser for the user without admin rights and no UAC prompt should appear for standard users.

What went wrong?
Version 58 seems to have some new routines where its trying to register itself as an available browser somewhere in HKLM as the user logged in, and not as part of the upgrade.

The fact it constantly prompts for UAC access seems to suggest that its either not successful in registering itself or whatever test is being performed isn't returning correctly.

Did this work before? Yes 57

Chrome version: 58.0.3029.81  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: 

This is quite a big problem for us as while the error message for users is open, chrome refuses to download files or print.  A number of users have failed to notice the elevation denied error message as its behind chrome when it opens.