[heap] New heuristics for incremental marking step size.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 55914d66c0169f8d49c123b4aacfae65dd123742..606b2b60a8035a137be9f954140f67858348fb95 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -1709,10 +1709,6 @@ class Heap {
   // Flush the number to string cache.
   void FlushNumberStringCache();
 
-  // TODO(hpayer): Allocation site pretenuring may make this method obsolete.
-  // Re-visit incremental marking heuristics.
-  bool IsHighSurvivalRate() { return high_survival_rate_period_length_ > 0; }
-
   void ConfigureInitialOldGenerationSize();
 
   bool HasLowYoungGenerationAllocationRate();
@@ -2196,7 +2192,6 @@ class Heap {
 
   GCTracer* tracer_;
 
-  int high_survival_rate_period_length_;
   intptr_t promoted_objects_size_;
   double promotion_ratio_;
   double promotion_rate_;