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If there's a single user in chrome://settings, you can navigate to
chrome://settings/manageProfile to edit it (even though the UI doesn't
always let you). In this case, however, we shouldn't display the add/remove
desktop shortcut button in the manageProfile overlay (since the shortcut for
single users is a non-profile generic Chrome shortcut)

BUG=409735
TEST=Start Chrome. Ensure you only have one profile.
Go to chrome://settings/manageProfile. There shouldn't be an add/remove
shortcut button.

Review URL: https://codereview.chromium.org/542843002

Cr-Commit-Position: refs/heads/master@{#293804}