Revert of Version 4.5.103.23 (cherry-pick)

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index 38166439eadebe036c2366cf52b40a599cb5f1aa..6fb429ae7d6e6280e13ac750bcf1da95eddd33b9 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -837,23 +837,6 @@ class Heap {
   // incremental steps.
   void StartIdleIncrementalMarking();
 
-  // Starts incremental marking assuming incremental marking is currently
-  // stopped.
-  void StartIncrementalMarking(int gc_flags,
-                               const GCCallbackFlags gc_callback_flags,
-                               const char* reason = nullptr);
-
-  // Performs incremental marking steps of step_size_in_bytes as long as
-  // deadline_ins_ms is not reached. step_size_in_bytes can be 0 to compute
-  // an estimate increment. Returns the remaining time that cannot be used
-  // for incremental marking anymore because a single step would exceed the
-  // deadline.
-  double AdvanceIncrementalMarking(
-      intptr_t step_size_in_bytes, double deadline_in_ms,
-      IncrementalMarking::StepActions step_actions);
-
-  void FinalizeIncrementalMarkingIfComplete(const char* comment);
-
   inline void increment_scan_on_scavenge_pages() {
     scan_on_scavenge_pages_++;
     if (FLAG_gc_verbose) {
@@ -1644,8 +1627,6 @@ class Heap {
   bool HasHighFragmentation();
   bool HasHighFragmentation(intptr_t used, intptr_t committed);
 
-  bool ShouldOptimizeForMemoryUsage() { return optimize_for_memory_usage_; }
-
  protected:
   // Methods made available to tests.
 
@@ -2286,8 +2267,6 @@ class Heap {
 
   bool HasLowYoungGenerationAllocationRate();
   bool HasLowOldGenerationAllocationRate();
-  double YoungGenerationMutatorUtilization();
-  double OldGenerationMutatorUtilization();
 
   void ReduceNewSpaceSize();