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This fixes a weird interaction between to tasks involving settings reset:
 - Post-cleanup settings reset, which can happen at start up after the
   Chrome Cleanup Tool successfully completed (for example, it may have
   required a reboot);
 - Settings reset prompt, which will check if user settings have been
   hijacked and offer the user to reset it to its default values.

In case both features are enabled, we should only check the latter after
completing the former, so that we will not prompt users to reset their
settings if they have already agreed on resetting them post-cleanup.

BUG=690020

Review-Url: https://codereview.chromium.org/2971183002
Cr-Commit-Position: refs/heads/master@{#485274}