Remove lazy sweeping.

src/heap.cc

Index: src/heap.cc
diff --git a/src/heap.cc b/src/heap.cc
index a1070fab4b1038974aea5582d78537a70fae1d35..d68593d0e1e3b8a7ffdf04fe08d4dfcf0211c462 100644
--- a/src/heap.cc
+++ b/src/heap.cc
@@ -4606,17 +4606,8 @@ bool Heap::IdleNotification(int hint) {
   // An incremental GC progresses as follows:
   // 1. many incremental marking steps,
   // 2. one old space mark-sweep-compact,
-  // 3. many lazy sweep steps.
   // Use mark-sweep-compact events to count incremental GCs in a round.
 
-  if (incremental_marking()->IsStopped()) {
-    if (!mark_compact_collector()->AreSweeperThreadsActivated() &&
-        !IsSweepingComplete() &&
-        !AdvanceSweepers(static_cast<int>(step_size))) {
-      return false;
-    }
-  }
-
   if (mark_sweeps_since_idle_round_started_ >= kMaxMarkSweepsInIdleRound) {
     if (EnoughGarbageSinceLastIdleRound()) {
       StartIdleRound();
@@ -5340,14 +5331,6 @@ intptr_t Heap::PromotedSpaceSizeOfObjects() {
 }
 
 
-bool Heap::AdvanceSweepers(int step_size) {
-  ASSERT(!mark_compact_collector()->AreSweeperThreadsActivated());
-  bool sweeping_complete = old_data_space()->AdvanceSweeper(step_size);
-  sweeping_complete &= old_pointer_space()->AdvanceSweeper(step_size);
-  return sweeping_complete;
-}
-
-
 int64_t Heap::PromotedExternalMemorySize() {
   if (amount_of_external_allocated_memory_
       <= amount_of_external_allocated_memory_at_last_global_gc_) return 0;