Revert "Allow declarative webrequest and webrequest in extensions."

extensions/browser/api/declarative/rules_registry_service.cc

Index: extensions/browser/api/declarative/rules_registry_service.cc
diff --git a/extensions/browser/api/declarative/rules_registry_service.cc b/extensions/browser/api/declarative/rules_registry_service.cc
index 9ddc450d66727494e544197ea28ad9a0ecc2e281..12df0135a3122468affc88ae27c61b99954f91e9 100644
--- a/extensions/browser/api/declarative/rules_registry_service.cc
+++ b/extensions/browser/api/declarative/rules_registry_service.cc
@@ -95,10 +95,8 @@ void RulesRegistryService::EnsureDefaultRulesRegistriesRegistered(
     scoped_refptr<ContentRulesRegistry> content_rules_registry =
         ExtensionsAPIClient::Get()->CreateContentRulesRegistry(
             browser_context_, content_rules_cache_delegate);
-    if (content_rules_registry.get() != nullptr) {
-      RegisterRulesRegistry(content_rules_registry);
-      content_rules_registry_ = content_rules_registry.get();
-    }
+    RegisterRulesRegistry(content_rules_registry);
+    content_rules_registry_ = content_rules_registry.get();
   }
 }