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Currently the DOM Distiller does not work in incognito, since the source
for the chrome-distiller:// scheme has not been registered.

This CL moves the functionality for registering the scheme to a generic place
and it is now used by both ProfileImpl and by OffTheRecordProfile during
profile creation.

It also makes both the normal profile and the incognito profile use the same
instance of the DomDistillerService.

BUG=380036

Review URL: https://codereview.chromium.org/608653002

Cr-Commit-Position: refs/heads/master@{#296974}