Revert of [Tracing] Use TracingCategoryObserver in runtime statistics

src/tracing/trace-event.h

Index: src/tracing/trace-event.h
diff --git a/src/tracing/trace-event.h b/src/tracing/trace-event.h
index a228608f1b702218dfa1040c615d720e8cf6929a..1cad33e0fc4a30f89e32508658b059d12b023352 100644
--- a/src/tracing/trace-event.h
+++ b/src/tracing/trace-event.h
@@ -249,10 +249,20 @@
   INTERNAL_TRACE_EVENT_UID(ScopedContext)                                  \
   INTERNAL_TRACE_EVENT_UID(scoped_context)(context);
 
+#define TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() \
+  base::NoBarrier_Load(&v8::internal::tracing::kRuntimeCallStatsTracingEnabled)
+
 #define TRACE_EVENT_CALL_STATS_SCOPED(isolate, category_group, name) \
   INTERNAL_TRACE_EVENT_CALL_STATS_SCOPED(isolate, category_group, name)
 
 #define INTERNAL_TRACE_EVENT_CALL_STATS_SCOPED(isolate, category_group, name)  \
+  {                                                                            \
+    INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(                                    \
+        TRACE_DISABLED_BY_DEFAULT("v8.runtime_stats"));                        \
+    base::NoBarrier_Store(                                                     \
+        &v8::internal::tracing::kRuntimeCallStatsTracingEnabled,               \
+        INTERNAL_TRACE_EVENT_CATEGORY_GROUP_ENABLED_FOR_RECORDING_MODE());     \
+  }                                                                            \
   INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category_group);                      \
   v8::internal::tracing::CallStatsScopedTracer INTERNAL_TRACE_EVENT_UID(       \
       tracer);                                                                 \