[Tracing] Use TracingCategoryObserver in runtime statistics

src/arguments.h

Index: src/arguments.h
diff --git a/src/arguments.h b/src/arguments.h
index 92c7075ee526f58315640e1d404688bb6f2d7d91..d5d2c02bf068d87a4851090fc2b8a27b09a5fc1e 100644
--- a/src/arguments.h
+++ b/src/arguments.h
@@ -96,8 +96,7 @@ double ClobberDoubleRegisters(double x1, double x2, double x3, double x4);
   Type Name(int args_length, Object** args_object, Isolate* isolate) {        \
     DCHECK(isolate->context() == nullptr || isolate->context()->IsContext()); \
     CLOBBER_DOUBLE_REGISTERS();                                               \
-    if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||       \
-                    FLAG_runtime_call_stats)) {                               \
+    if (V8_UNLIKELY(FLAG_runtime_stats)) {                                    \
       return Stats_##Name(args_length, args_object, isolate);                 \
     }                                                                         \
     Arguments args(args_length, args_object);                                 \