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

extensions/renderer/web_request_hooks.cc

Index: extensions/renderer/web_request_hooks.cc
diff --git a/extensions/renderer/web_request_hooks.cc b/extensions/renderer/web_request_hooks.cc
index ad2c3fbbd4f9da6b3e7652a131cc78872d485d98..0f833278e2d5860c8baa09d432bc8902a2bd4688 100644
--- a/extensions/renderer/web_request_hooks.cc
+++ b/extensions/renderer/web_request_hooks.cc
@@ -59,10 +59,8 @@ bool WebRequestHooks::CreateCustomEvent(
   DCHECK(event_spec);
   const base::ListValue* extra_params = nullptr;
   CHECK(event_spec->GetList("extraParameters", &extra_params));
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
   v8::Local<v8::Value> extra_parameters_spec =
-      converter->ToV8Value(extra_params, context);
+      content::V8ValueConverter::Create()->ToV8Value(extra_params, context);
 
   v8::Local<v8::Function> get_event = get_event_value.As<v8::Function>();
   v8::Local<v8::Value> args[] = {