Revert "Make more GCs in idle notification handler." because of performance

src/heap.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2243 matching lines @@
   }
 
   bool IsLowSurvivalRate() {
     return low_survival_rate_period_length_ > 0;
   }
 
   void SelectScavengingVisitorsTable();
 
   void StartIdleRound() {
     mark_sweeps_since_idle_round_started_ = 0;
+    ms_count_at_last_idle_notification_ = ms_count_;
   }
 
   void FinishIdleRound() {
     mark_sweeps_since_idle_round_started_ = kMaxMarkSweepsInIdleRound;
     scavenges_since_last_idle_round_ = 0;
   }
 
   bool EnoughGarbageSinceLastIdleRound() {
     return (scavenges_since_last_idle_round_ >= kIdleScavengeThreshold);
   }
@@ skipping 56 matching lines @@
 
   Marking marking_;
 
   IncrementalMarking incremental_marking_;
 
   int number_idle_notifications_;
   unsigned int last_idle_notification_gc_count_;
   bool last_idle_notification_gc_count_init_;
 
   int mark_sweeps_since_idle_round_started_;
+  int ms_count_at_last_idle_notification_;
   unsigned int gc_count_at_last_idle_gc_;
   int scavenges_since_last_idle_round_;
 
   // If the --deopt_every_n_garbage_collections flag is set to a positive value,
   // this variable holds the number of garbage collections since the last
   // deoptimization triggered by garbage collection.
   int gcs_since_last_deopt_;
 
 #ifdef VERIFY_HEAP
   int no_weak_embedded_maps_verification_scope_depth_;
@@ skipping 690 matching lines @@
   DisallowHeapAllocation no_allocation;  // i.e. no gc allowed.
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_H_