Convert PrefHashFilter enums to enum class.

chrome/browser/prefs/profile_pref_store_manager.cc

Index: chrome/browser/prefs/profile_pref_store_manager.cc
diff --git a/chrome/browser/prefs/profile_pref_store_manager.cc b/chrome/browser/prefs/profile_pref_store_manager.cc
index 891e7be0844b4ae6ca38065342c3fe0ad4b4333d..96a551f25919768c83540b3730ae8f157ac90bcc 100644
--- a/chrome/browser/prefs/profile_pref_store_manager.cc
+++ b/chrome/browser/prefs/profile_pref_store_manager.cc
@@ -120,7 +120,8 @@ PersistentPrefStore* ProfilePrefStoreManager::CreateProfilePrefStore(
            it = tracking_configuration_.begin();
        it != tracking_configuration_.end();
        ++it) {
-    if (it->enforcement_level > PrefHashFilter::NO_ENFORCEMENT) {
+    if (it->enforcement_level >
+        PrefHashFilter::EnforcementLevel::NO_ENFORCEMENT) {
       protected_configuration.push_back(*it);
       protected_pref_names.insert(it->name);
     } else {