Remove configuration policy on iOS.

ios/chrome/browser/prefs/browser_prefs.mm

Index: ios/chrome/browser/prefs/browser_prefs.mm
diff --git a/ios/chrome/browser/prefs/browser_prefs.mm b/ios/chrome/browser/prefs/browser_prefs.mm
index ec6d7a90d63a0c4d4c45a349209d36d1308ec72b..39755ad957617f6e001ff26fef81a81197fd68fe 100644
--- a/ios/chrome/browser/prefs/browser_prefs.mm
+++ b/ios/chrome/browser/prefs/browser_prefs.mm
@@ -34,12 +34,6 @@
 #include "ios/public/provider/chrome/browser/chrome_browser_provider.h"
 #include "ui/base/l10n/l10n_util.h"
 
-#if defined(ENABLE_CONFIGURATION_POLICY)
-#include "components/policy/core/browser/browser_policy_connector.h"
-#include "components/policy/core/browser/url_blacklist_manager.h"
-#include "components/policy/core/common/policy_statistics_collector.h"
-#endif  // defined(ENABLE_CONFIGURATION_POLICY)
-
 namespace {
 
 // TODO(crbug.com/525079): those preferences are not used on iOS but are
@@ -60,11 +54,6 @@ void RegisterLocalStatePrefs(PrefRegistrySimple* registry) {
   variations::VariationsService::RegisterPrefs(registry);
   web_resource::PromoResourceService::RegisterPrefs(registry);
 
-#if defined(ENABLE_CONFIGURATION_POLICY)
-  policy::BrowserPolicyConnector::RegisterPrefs(registry);
-  policy::PolicyStatisticsCollector::RegisterPrefs(registry);
-#endif
-
   // Preferences related to the browser state manager.
   registry->RegisterStringPref(ios::prefs::kBrowserStateLastUsed,
                                std::string());
@@ -103,10 +92,6 @@ void RegisterBrowserStatePrefs(user_prefs::PrefRegistrySyncable* registry) {
   web_resource::PromoResourceService::RegisterProfilePrefs(registry);
   ZeroSuggestProvider::RegisterProfilePrefs(registry);
 
-#if defined(ENABLE_CONFIGURATION_POLICY)
-  policy::URLBlacklistManager::RegisterProfilePrefs(registry);
-#endif
-
   registry->RegisterBooleanPref(
       ios::prefs::kEnableDoNotTrack, false,
       user_prefs::PrefRegistrySyncable::SYNCABLE_PREF);