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

extensions/renderer/i18n_custom_bindings.cc

Index: extensions/renderer/i18n_custom_bindings.cc
diff --git a/extensions/renderer/i18n_custom_bindings.cc b/extensions/renderer/i18n_custom_bindings.cc
index 57e0e96e2e8bfb4f1037fc3a2523056540731e56..828a437628f7e4901d82dc5f9102e6eb971767af 100644
--- a/extensions/renderer/i18n_custom_bindings.cc
+++ b/extensions/renderer/i18n_custom_bindings.cc
@@ -104,9 +104,8 @@ v8::Local<v8::Value> LanguageDetectionResult::ToValue(ScriptContext* context) {
   v8::Isolate* isolate = v8_context->GetIsolate();
   v8::EscapableHandleScope handle_scope(isolate);
 
-  std::unique_ptr<content::V8ValueConverter> converter(
-      content::V8ValueConverter::create());
-  v8::Local<v8::Value> result = converter->ToV8Value(&dict_value, v8_context);
+  v8::Local<v8::Value> result =
+      content::V8ValueConverter::Create()->ToV8Value(&dict_value, v8_context);
   return handle_scope.Escape(result);
 }