[Desktop] Fix deps in //brave/components/content_settings/core/browser/*

[jumde]

$ gn check . //brave/components/content_settings/core/browser/*
ERROR at //brave/components/content_settings/core/browser/brave_content_settings_ephemeral_provider.h:11:11: Include not allowed.
#include "components/content_settings/core/browser/content_settings_ephemeral_provider.h"
          ^-----------------------------------------------------------------------------
It is not in any dependency of
  //brave/components/content_settings/core/browser:browser
The include file is in the target(s):
  //components/content_settings/core/browser:browser
which should somehow be reachable.
___________________
ERROR at //brave/components/content_settings/core/browser/brave_content_settings_pref_provider.h:15:11: Include not allowed.
#include "components/content_settings/core/browser/content_settings_observer.h"
          ^-------------------------------------------------------------------
It is not in any dependency of
  //brave/components/content_settings/core/browser:browser
The include file is in the target(s):
  //components/content_settings/core/browser:browser
which should somehow be reachable.