Re-land: gin: Use V8 Maybe APIs

gin/test/file.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/test/file.h"
 
 #include <iostream>
 
 #include "base/bind.h"
 #include "base/files/file_enumerator.h"
@@ skipping 41 matching lines @@
   const base::FilePath& path = base::FilePath::FromUTF8Unsafe(filename);
   if (!base::DirectoryExists(path))
     return v8::Null(args->isolate());
 
   std::vector<std::string> names;
   base::FileEnumerator e(path, false, base::FileEnumerator::FILES);
   for (base::FilePath name = e.Next(); !name.empty(); name = e.Next()) {
     names.push_back(name.BaseName().AsUTF8Unsafe());
   }
 
-  return gin::Converter<std::vector<std::string> >::ToV8(args->isolate(),
-                                                         names);
+  v8::Local<v8::Value> v8_names;
+  if (!TryConvertToV8(args->isolate(), names, &v8_names))
+    return v8::Null(args->isolate());
+  return v8_names;
 }
 
 gin::WrapperInfo g_wrapper_info = { gin::kEmbedderNativeGin };
 
 }  // namespace
 
 const char File::kModuleName[] = "file";
 
 v8::Local<v8::Value> File::GetModule(v8::Isolate* isolate) {
   gin::PerIsolateData* data = gin::PerIsolateData::From(isolate);
   v8::Local<ObjectTemplate> templ = data->GetObjectTemplate(&g_wrapper_info);
   if (templ.IsEmpty()) {
     templ = gin::ObjectTemplateBuilder(isolate)
         .SetMethod("readFileToString", ReadFileToString)
         .SetMethod("getFilesInDirectory", GetFilesInDirectory)
         .SetMethod("getSourceRootDirectory", GetSourceRootDirectory)
         .Build();
     data->SetObjectTemplate(&g_wrapper_info, templ);
   }
   return templ->NewInstance();
 }
 
 }  // namespace gin