Revert of [tracing] Add native allocation tracing mode.

base/trace_event/heap_profiler.h

Index: base/trace_event/heap_profiler.h
diff --git a/base/trace_event/heap_profiler.h b/base/trace_event/heap_profiler.h
index 3ac16cd53b0d5ae2270aa5d1cb41152842bd58a9..dd587e5e4c72ea40fbfb2bb353dd0052b8688b34 100644
--- a/base/trace_event/heap_profiler.h
+++ b/base/trace_event/heap_profiler.h
@@ -33,20 +33,16 @@
 class BASE_EXPORT HeapProfilerScopedIgnore {
  public:
   inline HeapProfilerScopedIgnore() {
-    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()
           ->begin_ignore_scope();
     }
   }
   inline ~HeapProfilerScopedIgnore() {
-    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()
           ->end_ignore_scope();
     }
   }