[heap] Remove Marking::BlackToWhite and Marking::GreyToWhite.

src/heap/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 125 matching lines @@
   if (from == to) return;
 
   MarkBit new_mark_bit = ObjectMarking::MarkBitFrom(to);
   MarkBit old_mark_bit = ObjectMarking::MarkBitFrom(from);
 
 #ifdef DEBUG
   Marking::ObjectColor old_color = Marking::Color(old_mark_bit);
 #endif
 
   if (Marking::IsBlack(old_mark_bit)) {
-    Marking::BlackToWhite(old_mark_bit);
+    Marking::MarkWhite(old_mark_bit);
     Marking::WhiteToBlack(new_mark_bit);
     return;
   } else if (Marking::IsGrey(old_mark_bit)) {
-    Marking::GreyToWhite(old_mark_bit);
+    Marking::MarkWhite(old_mark_bit);
     Marking::WhiteToGrey(new_mark_bit);
     heap->mark_compact_collector()->marking_deque()->Push(to);
     heap->incremental_marking()->RestartIfNotMarking();
   }
 
 #ifdef DEBUG
   Marking::ObjectColor new_color = Marking::Color(new_mark_bit);
   DCHECK(new_color == old_color);
 #endif
 }
@@ skipping 1007 matching lines @@
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 
 }  // namespace internal
 }  // namespace v8