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

test/unittests/heap/marking-unittest.cc

Index: test/unittests/heap/marking-unittest.cc
diff --git a/test/unittests/heap/marking-unittest.cc b/test/unittests/heap/marking-unittest.cc
index 4f80d384dd789f4dfd7d87010721cad3a66540b0..28e58ca48772c5724511e694e97f7da5efbe1409 100644
--- a/test/unittests/heap/marking-unittest.cc
+++ b/test/unittests/heap/marking-unittest.cc
@@ -25,7 +25,7 @@ TEST(Marking, TransitionWhiteBlackWhite) {
     Marking::WhiteToBlack(mark_bit);
     CHECK(Marking::IsBlack(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
-    Marking::BlackToWhite(mark_bit);
+    Marking::MarkWhite(mark_bit);
     CHECK(Marking::IsWhite(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
   }
@@ -55,7 +55,7 @@ TEST(Marking, TransitionWhiteGreyBlackGrey) {
     CHECK(Marking::IsGrey(mark_bit));
     CHECK(Marking::IsBlackOrGrey(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
-    Marking::GreyToWhite(mark_bit);
+    Marking::MarkWhite(mark_bit);
     CHECK(Marking::IsWhite(mark_bit));
     CHECK(!Marking::IsImpossible(mark_bit));
   }