src: replace IsConstructCall functions with lambda

I noticed that there are three static functions that only check if
args is a construct call. This commit suggests replacing them and
them with a lambda.

src/cares_wrap.cc

@@ -115,11 +115,6 @@ GetAddrInfoReqWrap::GetAddrInfoReqWrap(Environment* env,
 }
 
 
-void NewGetAddrInfoReqWrap(const FunctionCallbackInfo<Value>& args) {
-  CHECK(args.IsConstructCall());
-}
-
-
 class GetNameInfoReqWrap : public ReqWrap<uv_getnameinfo_t> {
  public:
   GetNameInfoReqWrap(Environment* env, Local<Object> req_wrap_obj);
@@ -134,16 +129,6 @@ GetNameInfoReqWrap::GetNameInfoReqWrap(Environment* env,
 }
 
 
-void NewGetNameInfoReqWrap(const FunctionCallbackInfo<Value>& args) {
-  CHECK(args.IsConstructCall());
-}
-
-
-void NewQueryReqWrap(const FunctionCallbackInfo<Value>& args) {
-  CHECK(args.IsConstructCall());
-}
-
-
 int cmp_ares_tasks(const node_ares_task* a, const node_ares_task* b) {
   if (a->sock < b->sock)
     return -1;
@@ -1400,24 +1385,28 @@ void Initialize(Local<Object> target,
   target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "AI_V4MAPPED"),
               Integer::New(env->isolate(), AI_V4MAPPED));
 
+  auto is_construct_call_callback =
+      [](const FunctionCallbackInfo<Value>& args) {
+    CHECK(args.IsConstructCall());
+  };
   Local<FunctionTemplate> aiw =
-      FunctionTemplate::New(env->isolate(), NewGetAddrInfoReqWrap);
+      FunctionTemplate::New(env->isolate(), is_construct_call_callback);
   aiw->InstanceTemplate()->SetInternalFieldCount(1);
   aiw->SetClassName(
       FIXED_ONE_BYTE_STRING(env->isolate(), "GetAddrInfoReqWrap"));
   target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "GetAddrInfoReqWrap"),
               aiw->GetFunction());
 
   Local<FunctionTemplate> niw =
-      FunctionTemplate::New(env->isolate(), NewGetNameInfoReqWrap);
+      FunctionTemplate::New(env->isolate(), is_construct_call_callback);
   niw->InstanceTemplate()->SetInternalFieldCount(1);
   niw->SetClassName(
       FIXED_ONE_BYTE_STRING(env->isolate(), "GetNameInfoReqWrap"));
   target->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "GetNameInfoReqWrap"),
               niw->GetFunction());
 
   Local<FunctionTemplate> qrw =
-      FunctionTemplate::New(env->isolate(), NewQueryReqWrap);
+      FunctionTemplate::New(env->isolate(), is_construct_call_callback);
   qrw->InstanceTemplate()->SetInternalFieldCount(1);
   qrw->SetClassName(
       FIXED_ONE_BYTE_STRING(env->isolate(), "QueryReqWrap"));