Revert "Return MaybeHandle from NewConsString."

src/func-name-inferrer.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 68 matching lines @@
   if (pos < names_stack_.length() - 1 &&
       names_stack_.at(pos).type == kVariableName &&
       names_stack_.at(pos + 1).type == kVariableName) {
     // Skip consecutive variable declarations.
     return MakeNameFromStackHelper(pos + 1, prev);
   } else {
     if (prev->length() > 0) {
       Handle<String> name = names_stack_.at(pos).name;
       if (prev->length() + name->length() + 1 > String::kMaxLength) return prev;
       Factory* factory = isolate()->factory();
-      Handle<String> curr =
-          factory->NewConsString(factory->dot_string(), name).ToHandleChecked();
-      curr = factory->NewConsString(prev, curr).ToHandleChecked();
+      Handle<String> curr = factory->NewConsString(factory->dot_string(), name);
+      CHECK_NOT_EMPTY_HANDLE(isolate(), curr);
+      curr = factory->NewConsString(prev, curr);
+      CHECK_NOT_EMPTY_HANDLE(isolate(), curr);
       return MakeNameFromStackHelper(pos + 1, curr);
     } else {
       return MakeNameFromStackHelper(pos + 1, names_stack_.at(pos).name);
     }
   }
 }
 
 
 void FuncNameInferrer::InferFunctionsNames() {
   Handle<String> func_name = MakeNameFromStack();
   for (int i = 0; i < funcs_to_infer_.length(); ++i) {
     funcs_to_infer_[i]->set_inferred_name(func_name);
   }
   funcs_to_infer_.Rewind(0);
 }
 
 
 } }  // namespace v8::internal