Use GetPermissionStatus instead of DesktopNotificationProfileUtil::GetContentSetting

DesktopNotificationProfileUtil::GetContentSetting() will call directly into
HostContentSettingsMap::GetContentSetting() and thus miss some checks in
permission layer.

In this CL DesktopNotificationProfileUtil::GetContentSetting()is removed and all
its call sites are changed to call PermissionManager::GetPermissionStatus().

Review-Url: https://codereview.chromium.org/2020063003
Cr-Commit-Position: refs/heads/master@{#397960}
10 files changed