src: remove unused env->vm_parsing_context_symbol

Stopped being used via 77b52fd, was
originally added in d932e80.

For the one remaining usecase inside of `lib/vm.js`, define a Symbol at
the top of the file.

PR-URL: #22034
Reviewed-By: Gus Caplan <me@gus.host>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

lib/vm.js

@@ -23,16 +23,15 @@
 
 const {
   ContextifyScript,
-  kParsingContext,
   makeContext,
   isContext: _isContext,
 } = process.binding('contextify');
-
 const {
   ERR_INVALID_ARG_TYPE,
   ERR_OUT_OF_RANGE
 } = require('internal/errors').codes;
 const { isUint8Array } = require('internal/util/types');
+const kParsingContext = Symbol('script parsing context');
 
 class Script extends ContextifyScript {
   constructor(code, options = {}) {

src/env.h

@@ -346,7 +346,6 @@ struct PackageConfig {
   V(tls_wrap_constructor_function, v8::Function)                              \
   V(tty_constructor_template, v8::FunctionTemplate)                           \
   V(udp_constructor_function, v8::Function)                                   \
-  V(vm_parsing_context_symbol, v8::Symbol)                                    \
   V(url_constructor_function, v8::Function)                                   \
   V(write_wrap_template, v8::ObjectTemplate)
 

src/node_contextify.cc

@@ -608,16 +608,6 @@ class ContextifyScript : public BaseObject {
 
     target->Set(class_name, script_tmpl->GetFunction());
     env->set_script_context_constructor_template(script_tmpl);
-
-    Local<Symbol> parsing_context_symbol =
-        Symbol::New(env->isolate(),
-                    FIXED_ONE_BYTE_STRING(env->isolate(),
-                                          "script parsing context"));
-    env->set_vm_parsing_context_symbol(parsing_context_symbol);
-    target->Set(env->context(),
-                FIXED_ONE_BYTE_STRING(env->isolate(), "kParsingContext"),
-                parsing_context_symbol)
-        .FromJust();
   }