Revert of [counters] adding runtime call timers for GC

src/heap/gc-tracer.cc

Index: src/heap/gc-tracer.cc
diff --git a/src/heap/gc-tracer.cc b/src/heap/gc-tracer.cc
index e3828e58efdf6be4404ecd4ce84910d568be3870..4d02fdeff57071ef61ec73ca3feb90653ca27eb2 100644
--- a/src/heap/gc-tracer.cc
+++ b/src/heap/gc-tracer.cc
@@ -24,13 +24,6 @@
 GCTracer::Scope::Scope(GCTracer* tracer, ScopeId scope)
     : tracer_(tracer), scope_(scope) {
   start_time_ = tracer_->heap_->MonotonicallyIncreasingTimeInMs();
-  // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
-    RuntimeCallStats* stats =
-        tracer_->heap_->isolate()->counters()->runtime_call_stats();
-    timer_.Initialize(&stats->GC, stats->current_timer());
-    stats->Enter(&timer_);
-  }
 }
 
 
@@ -38,10 +31,6 @@
   DCHECK(scope_ < NUMBER_OF_SCOPES);  // scope_ is unsigned.
   tracer_->current_.scopes[scope_] +=
       tracer_->heap_->MonotonicallyIncreasingTimeInMs() - start_time_;
-  // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
-    tracer_->heap_->isolate()->counters()->runtime_call_stats()->Leave(&timer_);
-  }
 }
 
 
@@ -193,13 +182,6 @@
       start_time, committed_memory);
   heap_->isolate()->counters()->aggregated_memory_heap_used()->AddSample(
       start_time, used_memory);
-  // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
-    RuntimeCallStats* stats =
-        heap_->isolate()->counters()->runtime_call_stats();
-    timer_.Initialize(&stats->GC, stats->current_timer());
-    stats->Enter(&timer_);
-  }
 }
 
 
@@ -299,10 +281,6 @@
   longest_incremental_marking_finalization_step_ = 0.0;
   cumulative_incremental_marking_finalization_steps_ = 0;
   cumulative_incremental_marking_finalization_duration_ = 0.0;
-  // TODO(cbruni): remove once we fully moved to a trace-based system.
-  if (FLAG_runtime_call_stats) {
-    heap_->isolate()->counters()->runtime_call_stats()->Leave(&timer_);
-  }
 }