src: remove unused using declarations in src/api

PR-URL: #28506
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: danbev

src/api/async_resource.cc

@@ -4,7 +4,6 @@
 namespace node {
 
 using v8::Function;
-using v8::HandleScope;
 using v8::Isolate;
 using v8::Local;
 using v8::MaybeLocal;

src/api/environment.cc

@@ -21,7 +21,6 @@ using v8::HandleScope;
 using v8::Isolate;
 using v8::Local;
 using v8::MaybeLocal;
-using v8::Message;
 using v8::MicrotasksPolicy;
 using v8::Null;
 using v8::Object;

src/api/exceptions.cc

@@ -12,11 +12,9 @@
 namespace node {
 
 using v8::Exception;
-using v8::HandleScope;
 using v8::Integer;
 using v8::Isolate;
 using v8::Local;
-using v8::Message;
 using v8::NewStringType;
 using v8::Object;
 using v8::String;