Remove some uses of MaybeObject methods.

test/cctest/test-strings.cc

Index: test/cctest/test-strings.cc
diff --git a/test/cctest/test-strings.cc b/test/cctest/test-strings.cc
index d4dc51692d988f9ae07b74562afc501d6f1a7ffa..0574c69590a2d8d93dd2050b9cbb45af71894021 100644
--- a/test/cctest/test-strings.cc
+++ b/test/cctest/test-strings.cc
@@ -1087,7 +1087,7 @@ TEST(CachedHashOverflow) {
     CHECK_EQ(results[i]->IsUndefined(), result->IsUndefined());
     CHECK_EQ(results[i]->IsNumber(), result->IsNumber());
     if (result->IsNumber()) {
-      CHECK_EQ(Smi::cast(results[i]->ToSmi()->ToObjectChecked())->value(),
+      CHECK_EQ(Handle<Smi>::cast(Object::ToSmi(isolate, results[i]))->value(),
                result->ToInt32()->Value());
     }
   }