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This patch adds TabSpecificContentSettings::Delegate into
ContentSettingsUsagesState. ContentSettingsUsagesState::GetDetailedInfo
verifies if ContentSettings is under embargo so that the dialog no
longer incorrectly claims that the setting will be cleared after the
page is reloaded.
Added method TabSpecificContentSettings::Delegate::GetEmbargoSetting to
get ContentSetting of embargoed origin.

Bug: 1068162
Change-Id: I6cbd3cfedff0072b16b2c2ae07188e2564b1d69e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2165744
Commit-Queue: Illia Klimov <elklm@google.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770664}