[Content] Update V8ValueConverter::create to return a std::unique_ptr

extensions/renderer/event_bindings.cc

Index: extensions/renderer/event_bindings.cc
diff --git a/extensions/renderer/event_bindings.cc b/extensions/renderer/event_bindings.cc
index 03635433bed9af6f1ae7e5b0d69a5766d41149f5..30da489d3dd4ea8953cdc5ee0da3fa87527c0bd6 100644
--- a/extensions/renderer/event_bindings.cc
+++ b/extensions/renderer/event_bindings.cc
@@ -276,10 +276,9 @@ void EventBindings::AttachFilteredEvent(
 
   std::unique_ptr<base::DictionaryValue> filter;
   {
-    std::unique_ptr<content::V8ValueConverter> converter(
-        content::V8ValueConverter::create());
-    std::unique_ptr<base::Value> filter_value(converter->FromV8Value(
-        v8::Local<v8::Object>::Cast(args[1]), context()->v8_context()));
+    std::unique_ptr<base::Value> filter_value =
+        content::V8ValueConverter::Create()->FromV8Value(
+            v8::Local<v8::Object>::Cast(args[1]), context()->v8_context());
     if (!filter_value || !filter_value->IsType(base::Value::Type::DICTIONARY)) {
       args.GetReturnValue().Set(static_cast<int32_t>(-1));
       return;