[Tracing] Use TracingCategoryObserver in runtime statistics

src/builtins/builtins-utils.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BUILTINS_BUILTINS_UTILS_H_
 #define V8_BUILTINS_BUILTINS_UTILS_H_
 
 #include "src/arguments.h"
 #include "src/base/logging.h"
 #include "src/builtins/builtins.h"
@@ skipping 73 matching lines @@
     BuiltinArguments args(args_length, args_object);                          \
     RuntimeCallTimerScope timer(isolate, &RuntimeCallStats::Builtin_##name);  \
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"),                     \
                  "V8.Builtin_" #name);                                        \
     return Builtin_Impl_##name(args, isolate);                                \
   }                                                                           \
                                                                               \
   MUST_USE_RESULT Object* Builtin_##name(                                     \
       int args_length, Object** args_object, Isolate* isolate) {              \
     DCHECK(isolate->context() == nullptr || isolate->context()->IsContext()); \
-    if (V8_UNLIKELY(TRACE_EVENT_RUNTIME_CALL_STATS_TRACING_ENABLED() ||       \
-                    FLAG_runtime_call_stats)) {                               \
+    if (V8_UNLIKELY(FLAG_runtime_stats)) {                                    \
       return Builtin_Impl_Stats_##name(args_length, args_object, isolate);    \
     }                                                                         \
     BuiltinArguments args(args_length, args_object);                          \
     return Builtin_Impl_##name(args, isolate);                                \
   }                                                                           \
                                                                               \
   MUST_USE_RESULT static Object* Builtin_Impl_##name(BuiltinArguments args,   \
                                                      Isolate* isolate)
 
 // ----------------------------------------------------------------------------
@@ skipping 20 matching lines @@
                      isolate->factory()->NewStringFromAsciiChecked(method))); \
   }                                                                           \
   Handle<String> name;                                                        \
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(                                         \
       isolate, name, Object::ToString(isolate, args.receiver()))
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_BUILTINS_BUILTINS_UTILS_H_