Make progress in incremental marking if scavenge is delaying mark-sweep.

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index 2bd037f15b1e32d7b4e4c182b43638a2cc434fb4..0391e0e526416264300f9188e49d427f78dbbdcb 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -1569,10 +1569,6 @@ class Heap {
   // The roots that have an index less than this are always in old space.
   static const int kOldSpaceRoots = 0x20;
 
-  bool idle_notification_will_schedule_next_gc() {
-    return idle_notification_will_schedule_next_gc_;
-  }
-
   uint32_t HashSeed() {
     uint32_t seed = static_cast<uint32_t>(hash_seed()->value());
     ASSERT(FLAG_randomize_hashes || seed == 0);
@@ -2033,7 +2029,6 @@ class Heap {
   unsigned int last_idle_notification_gc_count_;
   bool last_idle_notification_gc_count_init_;
 
-  bool idle_notification_will_schedule_next_gc_;
   int mark_sweeps_since_idle_round_started_;
   int ms_count_at_last_idle_notification_;
   unsigned int gc_count_at_last_idle_gc_;