Revert of [tracing] Add native allocation tracing mode.

base/trace_event/trace_event.h

Index: base/trace_event/trace_event.h
diff --git a/base/trace_event/trace_event.h b/base/trace_event/trace_event.h
index 542537d7ed96ebf24c2f6d2ad409519404bacdc6..ef452f642f2ee7f419d0f213a77180a05accbc7d 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -1056,21 +1056,17 @@
  public:
   explicit ScopedTaskExecutionEvent(const char* task_context)
       : context_(task_context) {
-    using base::trace_event::AllocationContextTracker;
     if (UNLIKELY(
-            AllocationContextTracker::capture_mode() !=
-            AllocationContextTracker::CaptureMode::DISABLED)) {
-      AllocationContextTracker::GetInstanceForCurrentThread()
+            base::trace_event::AllocationContextTracker::capture_enabled())) {
+      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
           ->PushCurrentTaskContext(context_);
     }
   }
 
   ~ScopedTaskExecutionEvent() {
-    using base::trace_event::AllocationContextTracker;
     if (UNLIKELY(
-            AllocationContextTracker::capture_mode() !=
-            AllocationContextTracker::CaptureMode::DISABLED)) {
-      AllocationContextTracker::GetInstanceForCurrentThread()
+            base::trace_event::AllocationContextTracker::capture_enabled())) {
+      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
           ->PopCurrentTaskContext(context_);
     }
   }