Revert of [tracing] Adding task information to heap profiler

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 e7801e6eb7d6d3cca01bf8d9d68e704bce6354b4..2321d7ad62bd66c38653ab49b5d28e664b8a861d 100644
--- a/base/trace_event/trace_event.h
+++ b/base/trace_event/trace_event.h
@@ -18,7 +18,6 @@
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "base/trace_event/common/trace_event_common.h"
-#include "base/trace_event/heap_profiler_allocation_context_tracker.h"
 #include "base/trace_event/trace_event_system_stats_monitor.h"
 #include "base/trace_event/trace_log.h"
 #include "build/build_config.h"
@@ -210,10 +209,6 @@
 
 #define TRACE_EVENT_API_THREAD_BUCKET(thread_bucket)                           \
     g_trace_state[thread_bucket]
-
-// Scoped tracker for task execution context in the heap profiler.
-#define TRACE_EVENT_API_SCOPED_TASK_EXECUTION_EVENT \
-  trace_event_internal::ScopedTaskExecutionEvent
 
 ////////////////////////////////////////////////////////////////////////////////
 
@@ -1050,31 +1045,6 @@
   const char* previous_state_;
 };
 
-// ScopedTaskExecutionEvent records the current task's context in the heap
-// profiler.
-class ScopedTaskExecutionEvent {
- public:
-  explicit ScopedTaskExecutionEvent(const char* task_context)
-      : context_(task_context) {
-    if (UNLIKELY(
-            base::trace_event::AllocationContextTracker::capture_enabled())) {
-      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
-          ->PushCurrentTaskContext(context_);
-    }
-  }
-
-  ~ScopedTaskExecutionEvent() {
-    if (UNLIKELY(
-            base::trace_event::AllocationContextTracker::capture_enabled())) {
-      base::trace_event::AllocationContextTracker::GetInstanceForCurrentThread()
-          ->PopCurrentTaskContext(context_);
-    }
-  }
-
- private:
-  const char* context_;
-};
-
 }  // namespace trace_event_internal
 
 namespace base {