ChromeOS: Fix crash if login profile triggers client auth.
The login profile (which is identified with an empty username_hash) does not have an entry in the chromeos_user_map_, which would cause a crash (or DCHECK) when GetPrivateSlotForChromeOSUser was called. GetPrivateSlotForChromeOSUser is changed to return a NULL slot handle for this case. Updates NSSProfileFilterChromeOS to allow NULL slot handles, which it will now receive due to the above change. BUG=331945,302125 Review URL: https://codereview.chromium.org/123633002 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244690 0039d316-1c4b-4281-b951-d872f2087c98
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