Revert of GC: Refactor public incremental marking interface in heap

src/heap/incremental-marking.cc

Index: src/heap/incremental-marking.cc
diff --git a/src/heap/incremental-marking.cc b/src/heap/incremental-marking.cc
index f9b7319eb0cfab1a080893f0996967a87d0ee3b2..947c961af8993d6efc959d4d1c7765a1c2e352a1 100644
--- a/src/heap/incremental-marking.cc
+++ b/src/heap/incremental-marking.cc
@@ -14,13 +14,6 @@
 
 namespace v8 {
 namespace internal {
-
-
-IncrementalMarking::StepActions IncrementalMarking::NoForcedStepActions() {
-  return StepActions(IncrementalMarking::NO_GC_VIA_STACK_GUARD,
-                     IncrementalMarking::DO_NOT_FORCE_MARKING,
-                     IncrementalMarking::DO_NOT_FORCE_COMPLETION);
-}
 
 
 IncrementalMarking::IncrementalMarking(Heap* heap)
@@ -477,12 +470,9 @@
 }
 
 
-void IncrementalMarking::Start(int mark_compact_flags,
-                               const GCCallbackFlags gc_callback_flags,
-                               const char* reason) {
+void IncrementalMarking::Start(int mark_compact_flags) {
   if (FLAG_trace_incremental_marking) {
-    PrintF("[IncrementalMarking] Start (%s)\n",
-           (reason == nullptr) ? "unknown reason" : reason);
+    PrintF("[IncrementalMarking] Start\n");
   }
   DCHECK(FLAG_incremental_marking);
   DCHECK(FLAG_incremental_marking_steps);
@@ -492,7 +482,6 @@
 
   ResetStepCounters();
 
-  gc_callback_flags_ = gc_callback_flags;
   was_activated_ = true;
 
   if (!heap_->mark_compact_collector()->sweeping_in_progress()) {
@@ -835,7 +824,7 @@
 
 void IncrementalMarking::OldSpaceStep(intptr_t allocated) {
   if (IsStopped() && ShouldActivateEvenWithoutIdleNotification()) {
-    Start(Heap::kNoGCFlags, kNoGCCallbackFlags, "old space step");
+    Start(Heap::kNoGCFlags);
   } else {
     Step(allocated * kFastMarking / kInitialMarkingSpeed, GC_VIA_STACK_GUARD);
   }