Revert of [Tracing] Use TracingCategoryObserver in runtime statistics

src/log.cc

Index: src/log.cc
diff --git a/src/log.cc b/src/log.cc
index 722f6d378d06a1221fe7146e025491b6f5981977..004d5176b12802d4497c551b510479f52dedbcd2 100644
--- a/src/log.cc
+++ b/src/log.cc
@@ -27,7 +27,6 @@
 #include "src/runtime-profiler.h"
 #include "src/source-position-table.h"
 #include "src/string-stream.h"
-#include "src/tracing/tracing-category-observer.h"
 #include "src/vm-state-inl.h"
 
 namespace v8 {
@@ -1284,8 +1283,7 @@
 
 void Logger::TickEvent(v8::TickSample* sample, bool overflow) {
   if (!log_->IsEnabled() || !FLAG_prof_cpp) return;
-  if (V8_UNLIKELY(FLAG_runtime_stats ==
-                  v8::tracing::TracingCategoryObserver::ENABLED_BY_NATIVE)) {
+  if (FLAG_runtime_call_stats) {
     RuntimeCallTimerEvent();
   }
   Log::MessageBuilder msg(log_);