Shrink active semi-space and uncommit other semi-space only in idle memory mode.

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index e640d1ee65d7d98a75a35c76bcbb2b0dcb3b373c..8c1b459e0866a682ac5f9af160bcf0c20426ab3a 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -2101,11 +2101,9 @@ class Heap {
 
   void SelectScavengingVisitorsTable();
 
-  void ReduceNewSpaceSize(bool is_long_idle_notification);
-
   bool TryFinalizeIdleIncrementalMarking(
-      bool is_long_idle_notification, double idle_time_in_ms,
-      size_t size_of_objects, size_t mark_compact_speed_in_bytes_per_ms);
+      double idle_time_in_ms, size_t size_of_objects,
+      size_t mark_compact_speed_in_bytes_per_ms);
 
   void ClearObjectStats(bool clear_last_time_stats = false);