src: remove unused and unimplemented method in env.h

Signed-off-by: gengjiawen <[email protected]>

PR-URL: #25699
Reviewed-By: Anna Henningsen <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: gengjiawen

src/env.h

@@ -646,7 +646,6 @@ class Environment {
 
   inline v8::Isolate* isolate() const;
   inline uv_loop_t* event_loop() const;
-  inline uint32_t watched_providers() const;
   inline void TryLoadAddon(const char* filename,
                            int flags,
                            std::function<bool(binding::DLib*)> was_loaded);