src: remove unused macro in env.cc

PR-URL: #26273
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: gengjiawen

src/env.cc

@@ -47,8 +47,6 @@ using v8::Undefined;
 using v8::Value;
 using worker::Worker;
 
-#define kTraceCategoryCount 1
-
 // TODO(@jasnell): Likely useful to move this to util or node_internal to
 // allow reuse. But since we're not reusing it yet...
 class TraceEventScope {