Re-land: gin: Use V8 Maybe APIs

gin/converter_unittest.cc

 // Copyright 2013 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/converter.h"
 
 #include <limits.h>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 98 matching lines @@
 }
 
 TEST_F(ConverterTest, Vector) {
   HandleScope handle_scope(instance_->isolate());
 
   std::vector<int> expected;
   expected.push_back(-1);
   expected.push_back(0);
   expected.push_back(1);
 
-  Local<Array> js_array = Local<Array>::Cast(
-      Converter<std::vector<int>>::ToV8(instance_->isolate(), expected));
-  ASSERT_FALSE(js_array.IsEmpty());
-  EXPECT_EQ(3u, js_array->Length());
+  auto maybe = Converter<std::vector<int>>::ToV8(
+      instance_->isolate()->GetCurrentContext(), expected);
+  Local<Value> js_value;
+  EXPECT_TRUE(maybe.ToLocal(&js_value));
+  Local<Array> js_array2 = Local<Array>::Cast(js_value);
+  EXPECT_EQ(3u, js_array2->Length());
   for (size_t i = 0; i < expected.size(); ++i) {
     EXPECT_TRUE(Integer::New(instance_->isolate(), expected[i])
-                    ->StrictEquals(js_array->Get(static_cast<int>(i))));
+                    ->StrictEquals(js_array2->Get(static_cast<int>(i))));
   }
-
-  std::vector<int> actual;
-  EXPECT_TRUE(Converter<std::vector<int> >::FromV8(instance_->isolate(),
-                                                   js_array, &actual));
-  EXPECT_EQ(expected, actual);
 }
 
 }  // namespace gin