Refactored ConfigurationPolicyPrefStore to not depend on chrome/.

chrome/browser/policy/DEPS

 # The //chrome/browser/policy code is being converted into a component at
 # //components/policy. This DEPS file is temporarily restricting the include
 # rules for this code; once all the exceptions are fixed then the code will
 # be moved, and this file will be removed.
 # http://crbug.com/271392
 
 include_rules = [
   "-chrome",
   "-chromeos",
   "-content",
@@ skipping 62 matching lines @@
     "+chrome/common/pref_names.h",
     "+chrome/browser/chromeos/policy/configuration_policy_handler_chromeos.h",
     "+chromeos/dbus/power_policy_controller.h",
   ],
 
   r"configuration_policy_handler_unittest\.cc": [
     "+chrome/browser/extensions/external_policy_loader.h",
     "+chrome/common/pref_names.h",
   ],
 
-  r"configuration_policy_pref_store\.cc": [
-    "+chrome/browser/browser_process.h",
-    "+content/public/browser/browser_thread.h",
-  ],
-
   r"configuration_policy_pref_store_unittest\.cc": [
     "+chrome/browser/prefs/incognito_mode_prefs.h",
     "+chrome/browser/prefs/proxy_config_dictionary.h",
     "+chrome/common/content_settings.h",
     "+chrome/common/pref_names.h",
   ],
 
   r"configuration_policy_provider_test\.h": [
     "+content/public/test/test_browser_thread.h",
   ],
@@ skipping 48 matching lines @@
   ],
 
   r"registry_dict_win_unittest\.cc": [
     "+chrome/common/json_schema/json_schema_constants.h",
   ],
 
   r"test/local_policy_test_server\.cc": [
     "+chrome/common/chrome_paths.h",
   ],
 }