Handlify callers of Object::GetElement.

src/factory.cc

 // Copyright 2013 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 1098 matching lines @@
   Vector<char> v(buffer, kBufferSize);
   OS::StrNCpy(v, message, space);
   space -= Min(space, strlen(message));
   p = &buffer[kBufferSize] - space;
 
   for (unsigned i = 0; i < ARRAY_SIZE(args); i++) {
     if (space > 0) {
       *p++ = ' ';
       space--;
       if (space > 0) {
-        MaybeObject* maybe_arg = args->GetElement(isolate(), i);
-        Handle<String> arg_str(reinterpret_cast<String*>(maybe_arg));
+        Handle<String> arg_str = Handle<String>::cast(
+            Object::GetElement(isolate(), args, i));
+        CHECK_NOT_EMPTY_HANDLE(isolate(), arg_str);
         SmartArrayPointer<char> arg = arg_str->ToCString();
         Vector<char> v2(p, static_cast<int>(space));
         OS::StrNCpy(v2, arg.get(), space);
         space -= Min(space, strlen(arg.get()));
         p = &buffer[kBufferSize] - space;
       }
     }
   }
   if (space > 0) {
     *p = '\0';
@@ skipping 860 matching lines @@
   return Handle<Object>::null();
 }
 
 
 Handle<Object> Factory::ToBoolean(bool value) {
   return value ? true_value() : false_value();
 }
 
 
 } }  // namespace v8::internal