tools: use using-declaration consistently

PR-URL: #36245
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>

tools/snapshot/snapshot_builder.cc

@@ -25,7 +25,7 @@ void WriteVector(std::stringstream* ss, const T* vec, size_t size) {
   }
 }
 
-std::string FormatBlob(v8::StartupData* blob,
+std::string FormatBlob(StartupData* blob,
                        const std::vector<size_t>& isolate_data_indexes,
                        const EnvSerializeInfo& env_info) {
   std::stringstream ss;
@@ -75,9 +75,9 @@ const EnvSerializeInfo* NodeMainInstance::GetEnvSerializeInfo() {
   return ss.str();
 }
 
-static v8::StartupData SerializeNodeContextInternalFields(Local<Object> holder,
-                                                          int index,
-                                                          void* env) {
+static StartupData SerializeNodeContextInternalFields(Local<Object> holder,
+                                                      int index,
+                                                      void* env) {
   void* ptr = holder->GetAlignedPointerFromInternalField(index);
   if (ptr == nullptr || ptr == env) {
     return StartupData{nullptr, 0};