Remove unused GcTracer functions.

src/heap/gc-tracer.h

Index: src/heap/gc-tracer.h
diff --git a/src/heap/gc-tracer.h b/src/heap/gc-tracer.h
index 175a8ed5a786d3a9fe206d3ef2a7eca1111847de..73af01b07fe10113538f170c330a2f81d3f579c8 100644
--- a/src/heap/gc-tracer.h
+++ b/src/heap/gc-tracer.h
@@ -376,42 +376,6 @@ class GCTracer {
     return cumulative_sweeping_duration_;
   }
 
-  // Compute the mean duration of the last scavenger events. Returns 0 if no
-  // events have been recorded.
-  double MeanScavengerDuration() const {
-    return MeanDuration(scavenger_events_);
-  }
-
-  // Compute the max duration of the last scavenger events. Returns 0 if no
-  // events have been recorded.
-  double MaxScavengerDuration() const { return MaxDuration(scavenger_events_); }
-
-  // Compute the mean duration of the last mark compactor events. Returns 0 if
-  // no events have been recorded.
-  double MeanMarkCompactorDuration() const {
-    return MeanDuration(mark_compactor_events_);
-  }
-
-  // Compute the max duration of the last mark compactor events. Return 0 if no
-  // events have been recorded.
-  double MaxMarkCompactorDuration() const {
-    return MaxDuration(mark_compactor_events_);
-  }
-
-  // Compute the mean duration of the last incremental mark compactor
-  // events. Returns 0 if no events have been recorded.
-  double MeanIncrementalMarkCompactorDuration() const {
-    return MeanDuration(incremental_mark_compactor_events_);
-  }
-
-  // Compute the mean step duration of the last incremental marking round.
-  // Returns 0 if no incremental marking round has been completed.
-  double MeanIncrementalMarkingDuration() const;
-
-  // Compute the max step duration of the last incremental marking round.
-  // Returns 0 if no incremental marking round has been completed.
-  double MaxIncrementalMarkingDuration() const;
-
   // Compute the average incremental marking speed in bytes/millisecond.
   // Returns 0 if no events have been recorded.
   intptr_t IncrementalMarkingSpeedInBytesPerMillisecond() const;