Use [[DefineOwnProperty]] when converting IDL array values

third_party/WebKit/Source/bindings/core/v8/ToV8.h

Index: third_party/WebKit/Source/bindings/core/v8/ToV8.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ToV8.h b/third_party/WebKit/Source/bindings/core/v8/ToV8.h
index 3f4a97795b59ea2d00ceff072b9e83cefde0a52c..497deccc3af590703b7293ec67b9c0835d1cfb38 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ToV8.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ToV8.h
@@ -209,7 +209,7 @@ inline v8::Local<v8::Value> toV8SequenceInternal(const Sequence& sequence, v8::L
         v8::Local<v8::Value> value = toV8(*iter, array, isolate);
         if (value.IsEmpty())
             value = v8::Undefined(isolate);
-        if (!v8CallBoolean(array->Set(isolate->GetCurrentContext(), v8::Integer::New(isolate, index++), value)))
+        if (!v8CallBoolean(array->CreateDataProperty(isolate->GetCurrentContext(), index++, value)))
             return v8::Local<v8::Value>();
     }
     return array;
@@ -239,7 +239,7 @@ inline v8::Local<v8::Value> toV8(const Vector<std::pair<String, T>>& value, v8::
         v8::Local<v8::Value> v8Value = toV8(value[i].second, object, isolate);
         if (v8Value.IsEmpty())
             v8Value = v8::Undefined(isolate);
-        if (!v8CallBoolean(object->Set(isolate->GetCurrentContext(), v8String(isolate, value[i].first), v8Value)))
+        if (!v8CallBoolean(object->CreateDataProperty(isolate->GetCurrentContext(), v8String(isolate, value[i].first), v8Value)))
             return v8::Local<v8::Value>();
     }
     return object;