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ContentSettingsHandler is now made aware of Off The Record profiles
and will observe them as well, correcting bugs where changes from the
settings webUI would function incorrectly.

This is a rework of a previously landed fix [fix] which was reverted due to
a crash bug [crash] when OTR profiles already existed before settings
were opened.

[fix] https://codereview.chromium.org/585953003
[crash] https://code.google.com/p/chromium/issues/detail?id=417597

BUG=425079, 418931

Committed: https://crrev.com/c9ba380c606442a025a38eb67f4d35c65b1a293c
Cr-Commit-Position: refs/heads/master@{#301273}

Review URL: https://codereview.chromium.org/676083003

Cr-Commit-Position: refs/heads/master@{#301461}