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When non-default content settings changed to default, they should be kept in
Page Info because user might need to change them again.

If the navigation or refresh happens, content settings with default value
should not be shown in Page Info anymore.

Bug: 777275
Change-Id: Ica986ee6646b833bf47da05fb39abb786ce2259a
Reviewed-on: https://chromium-review.googlesource.com/792790
Commit-Queue: Raymes Khoury <raymes@chromium.org>
Reviewed-by: Raymes Khoury <raymes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522006}