Remove accidentally forgotten 3.5 RC1 code

arangod/RocksDBEngine/RocksDBEngine.cpp

@@ -1991,13 +1991,6 @@ std::unique_ptr<TRI_vocbase_t> RocksDBEngine::openExistingDatabase(
       TRI_ASSERT(slice.isArray());
 
       for (auto const& it : VPackArrayIterator(slice)) {
-        // we found a view that is still active
-        if (isUpgrade) {
-          LOG_TOPIC("8db62", FATAL, arangodb::iresearch::TOPIC)
-            << "Upgrading views is not supported in 3.5RC1, please drop all the existing views and manually recreate them after the upgrade is complete";
-          FATAL_ERROR_EXIT();
-        }
-
         TRI_ASSERT(!it.get("id").isNone());
 
         LogicalView::ptr view;