GitLab

current NO_RESOURCE_IDENTIFIER usage is aganinst style guidelines.
Made a class in content_settings.h and using function to get std::string()
To get rid of NO_RESOURCE_IDENTIFIER.
Now no need to add content_settings_provider.h in places like
desktop_notification_profile_util.cc and other places.

BUG=399592

Review URL: https://codereview.chromium.org/1034143002

Cr-Commit-Position: refs/heads/master@{#324362}