quic: use using declaration instead of explicit ns

node_quic_http3_application.cc has a few v8 specific using declarations
but they are currently not used and instead explicit namespacing is
used. This commit updates the code to use the using declarations and
also removes the ones that are no longer in use.

PR-URL: #380
Reviewed-By: James M Snell <[email protected]>

src/quic/node_quic_http3_application.cc

@@ -17,10 +17,8 @@
 
 namespace node {
 
-using v8::Eternal;
-using v8::MaybeLocal;
-using v8::String;
-using v8::Value;
+using v8::Array;
+using v8::Local;
 
 namespace quic {
 
@@ -238,7 +236,7 @@ bool Http3Application::SubmitHeaders(
 // SubmitHeaders() function on the created QuicStream.
 BaseObjectPtr<QuicStream> Http3Application::SubmitPush(
     int64_t id,
-    v8::Local<v8::Array> headers) {
+    Local<Array> headers) {
   // If the QuicSession is not a server session, return false
   // immediately. Push streams cannot be sent by an HTTP/3 client.
   if (!session()->is_server())
@@ -262,7 +260,7 @@ BaseObjectPtr<QuicStream> Http3Application::SubmitPush(
 // client
 bool Http3Application::SubmitInformation(
     int64_t stream_id,
-    v8::Local<v8::Array> headers) {
+    Local<Array> headers) {
   if (!session()->is_server())
     return false;
   Http3Headers nva(session()->env(), headers);
@@ -273,7 +271,7 @@ bool Http3Application::SubmitInformation(
 // submits response headers.
 bool Http3Application::SubmitHeaders(
     int64_t stream_id,
-    v8::Local<v8::Array> headers,
+    Local<Array> headers,
     uint32_t flags) {
   Http3Headers nva(session()->env(), headers);
   return SubmitHeaders(stream_id, nva, flags);
@@ -282,7 +280,7 @@ bool Http3Application::SubmitHeaders(
 // Submits trailing headers for the HTTP/3 request or response.
 bool Http3Application::SubmitTrailers(
     int64_t stream_id,
-    v8::Local<v8::Array> headers) {
+    Local<Array> headers) {
   Http3Headers nva(session()->env(), headers);
   return SubmitTrailers(stream_id, nva);
 }