Revert "Make sure that memory reducer makes progress in incremental marking"

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index f7eca4011a2b71d6dfe9c926a261f4693977d526..f974c0764b09dc9190e680d429a4c58950e57f22 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -902,8 +902,6 @@ class Heap {
   // Notify the heap that a context has been disposed.
   int NotifyContextDisposed(bool dependant_context);
 
-  void FinalizeIncrementalMarkingIfComplete(const char* comment);
-
   inline void increment_scan_on_scavenge_pages() {
     scan_on_scavenge_pages_++;
     if (FLAG_gc_verbose) {
@@ -1248,8 +1246,6 @@ class Heap {
   bool HasHighFragmentation();
   bool HasHighFragmentation(intptr_t used, intptr_t committed);
 
-  bool ShouldOptimizeForMemoryUsage() { return optimize_for_memory_usage_; }
-
   // ===========================================================================
   // Initialization. ===========================================================
   // ===========================================================================